/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
// Enemy (Base class)
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGfx = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = enemyGfx.width * 0.5;
	self.speed = ENEMY_BASE_SPEED + Math.random() * 4;
	self.moveType = Math.random() < 0.5 ? 'straight' : 'sine';
	self.sinePhase = Math.random() * Math.PI * 2;
	self.sineAmp = 120 + Math.random() * 120;
	self.shootCooldown = 60 + Math.floor(Math.random() * 60);
	// Health system for enemy
	self.maxHealth = 1;
	self.health = self.maxHealth;
	// Health bar
	var healthBarBg = self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 1.0,
		scaleY: 0.18,
		tint: 0x222222,
		y: enemyGfx.height * 0.7
	});
	var healthBar = self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 0.95,
		scaleY: 0.12,
		tint: 0x44ff44,
		y: enemyGfx.height * 0.7
	});
	self.update = function () {
		if (self.moveType === 'straight') {
			self.y += self.speed;
		} else {
			self.y += self.speed * 0.85;
			self.x += Math.sin(self.y / 120 + self.sinePhase) * 6;
		}
		// Clamp enemy inside left/right screen bounds
		var margin = self.radius;
		if (self.x < margin) self.x = margin;
		if (self.x > GAME_W - margin) self.x = GAME_W - margin;
		self.shootCooldown--;
		// Update health bar
		healthBar.scaleX = 0.95 * (self.health / self.maxHealth);
		if (self.health < 1) healthBar.scaleX = 0;
	};
	self.takeDamage = function (dmg) {
		self.health -= dmg;
		LK.effects.flashObject(self, 0xffffff, 80);
		if (self.health <= 0) {
			self.health = 0;
			// Death handled in game loop
		}
	};
	return self;
});
// Enemy Bullet
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGfx = self.attachAsset('enemyBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = ENEMY_BULLET_SPEED;
	self.dirX = 0;
	self.dirY = 1;
	self.update = function () {
		self.x += self.dirX * self.speed;
		self.y += self.dirY * self.speed;
	};
	return self;
});
// FastEnemy: moves faster, less health
var FastEnemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGfx = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	enemyGfx.tint = 0x00e1ff;
	self.radius = enemyGfx.width * 0.5;
	self.speed = ENEMY_FAST_SPEED + Math.random() * 4;
	self.moveType = 'straight';
	self.shootCooldown = 40 + Math.floor(Math.random() * 40);
	self.maxHealth = 1;
	self.health = self.maxHealth;
	// Health bar
	var healthBarBg = self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 1.0,
		scaleY: 0.18,
		tint: 0x222222,
		y: enemyGfx.height * 0.7
	});
	var healthBar = self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 0.95,
		scaleY: 0.12,
		tint: 0x00e1ff,
		y: enemyGfx.height * 0.7
	});
	self.update = function () {
		self.y += self.speed;
		// Clamp enemy inside left/right screen bounds
		var margin = self.radius;
		if (self.x < margin) self.x = margin;
		if (self.x > GAME_W - margin) self.x = GAME_W - margin;
		self.shootCooldown--;
		// Update health bar
		healthBar.scaleX = 0.95 * (self.health / self.maxHealth);
		if (self.health < 1) healthBar.scaleX = 0;
	};
	self.takeDamage = function (dmg) {
		self.health -= dmg;
		LK.effects.flashObject(self, 0x00e1ff, 60);
		if (self.health <= 0) self.health = 0;
	};
	return self;
});
// Player Bullet
var PlayerBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGfx = self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = PLAYER_BULLET_SPEED;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Powerup
var Powerup = Container.expand(function () {
	var self = Container.call(this);
	// Add new powerup types: tripleShot, megaShield, invincibility, doubleScore, slowMotion
	var types = ['rapid', 'shield', 'heal', 'doubleScore', 'slowMotion', 'tripleShot', 'megaShield', 'invincibility'];
	var r = Math.random();
	if (r < 0.22) self.type = 'rapid';else if (r < 0.37) self.type = 'shield';else if (r < 0.52) self.type = 'heal';else if (r < 0.65) self.type = 'doubleScore';else if (r < 0.77) self.type = 'slowMotion';else if (r < 0.87) self.type = 'tripleShot';else if (r < 0.95) self.type = 'megaShield';else self.type = 'invincibility';
	var powerupGfx = self.attachAsset('powerup', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	if (self.type === 'rapid') powerupGfx.tint = 0xffe100;else if (self.type === 'shield') powerupGfx.tint = 0x00ffff;else if (self.type === 'heal') powerupGfx.tint = 0x44ff44;else if (self.type === 'doubleScore') powerupGfx.tint = 0xff00ff;else if (self.type === 'slowMotion') powerupGfx.tint = 0x8888ff;else if (self.type === 'tripleShot') powerupGfx.tint = 0xff8800;else if (self.type === 'megaShield') powerupGfx.tint = 0x00ff88;else if (self.type === 'invincibility') powerupGfx.tint = 0xffffff;
	self.speed = 10;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Player Ship
var Ship = Container.expand(function () {
	var self = Container.call(this);
	var shipGfx = self.attachAsset('ship', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = shipGfx.width * 0.5;
	self.shootCooldown = 0;
	self.rapidFire = false;
	self.rapidFireTimer = 0;
	self.shield = false;
	self.shieldTimer = 0;
	// Health system for player
	self.maxHealth = 13; // Even more survivability for easier gameplay
	self.health = self.maxHealth;
	// Health bar
	var healthBarBg = self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 2.2,
		scaleY: 0.25,
		tint: 0x222222,
		y: shipGfx.height * 0.7
	});
	var healthBar = self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 2,
		scaleY: 0.18,
		tint: 0xff4444,
		y: shipGfx.height * 0.7
	});
	// Visual shield indicator
	var shieldGfx = self.attachAsset('ship', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 1.3,
		scaleY: 1.3,
		tint: 0x00ffff
	});
	shieldGfx.alpha = 0.25;
	shieldGfx.visible = false;
	self.update = function () {
		// Handle powerup timers
		if (self.rapidFire) {
			self.rapidFireTimer--;
			// Visual feedback for rapid fire: pulse ship color
			shipGfx.tint = LK.ticks % 10 < 5 ? 0xffe100 : 0x33c1ff;
			if (self.rapidFireTimer <= 0) {
				self.rapidFire = false;
				shipGfx.tint = 0x33c1ff;
			}
		} else {
			shipGfx.tint = 0x33c1ff;
		}
		if (self.shield) {
			self.shieldTimer--;
			shieldGfx.visible = true;
			if (self.shieldTimer <= 0) {
				self.shield = false;
				shieldGfx.visible = false;
			}
		} else {
			shieldGfx.visible = false;
		}
		// Update health bar
		healthBar.scaleX = 2 * (self.health / self.maxHealth);
		if (self.health < 1) healthBar.scaleX = 0;
	};
	self.activateRapidFire = function (duration) {
		self.rapidFire = true;
		self.rapidFireTimer = duration;
	};
	self.activateShield = function (duration) {
		self.shield = true;
		self.shieldTimer = duration;
		shieldGfx.visible = true;
	};
	self.takeDamage = function (dmg) {
		if (self.shield) return;
		self.health -= dmg;
		LK.effects.flashObject(self, 0xff0000, 200);
		if (self.health < 0) self.health = 0;
	};
	self.heal = function (amount) {
		self.health += amount;
		if (self.health > self.maxHealth) self.health = self.maxHealth;
	};
	return self;
});
// TankEnemy: slow, high health, shoots more
var TankEnemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGfx = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 1.3,
		scaleY: 1.3
	});
	enemyGfx.tint = 0xff4444;
	self.radius = enemyGfx.width * 0.65;
	self.speed = ENEMY_TANK_SPEED + Math.random() * 1.2;
	self.moveType = 'sine';
	self.sinePhase = Math.random() * Math.PI * 2;
	self.sineAmp = 180 + Math.random() * 80;
	self.shootCooldown = 30 + Math.floor(Math.random() * 30);
	self.maxHealth = 4;
	self.health = self.maxHealth;
	// Health bar
	var healthBarBg = self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 1.3,
		scaleY: 0.18,
		tint: 0x222222,
		y: enemyGfx.height * 0.9
	});
	var healthBar = self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 1.25,
		scaleY: 0.12,
		tint: 0xff4444,
		y: enemyGfx.height * 0.9
	});
	self.update = function () {
		self.y += self.speed * 0.7;
		self.x += Math.sin(self.y / 120 + self.sinePhase) * 10;
		// Clamp enemy inside left/right screen bounds
		var margin = self.radius;
		if (self.x < margin) self.x = margin;
		if (self.x > GAME_W - margin) self.x = GAME_W - margin;
		self.shootCooldown--;
		// Update health bar
		healthBar.scaleX = 1.25 * (self.health / self.maxHealth);
		if (self.health < 1) healthBar.scaleX = 0;
	};
	self.takeDamage = function (dmg) {
		self.health -= dmg;
		LK.effects.flashObject(self, 0xff4444, 100);
		if (self.health <= 0) self.health = 0;
	};
	return self;
});
// ZigzagEnemy: moves in zigzag, normal health
var ZigzagEnemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGfx = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	enemyGfx.tint = 0xffe100;
	self.radius = enemyGfx.width * 0.5;
	self.speed = ENEMY_ZIGZAG_SPEED + Math.random() * 3;
	self.moveType = 'zigzag';
	self.zigzagDir = Math.random() < 0.5 ? -1 : 1;
	self.zigzagTimer = 0;
	self.shootCooldown = 60 + Math.floor(Math.random() * 60);
	self.maxHealth = 2;
	self.health = self.maxHealth;
	// Health bar
	var healthBarBg = self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 1.0,
		scaleY: 0.18,
		tint: 0x222222,
		y: enemyGfx.height * 0.7
	});
	var healthBar = self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 0.95,
		scaleY: 0.12,
		tint: 0xffe100,
		y: enemyGfx.height * 0.7
	});
	self.update = function () {
		self.y += self.speed;
		self.zigzagTimer++;
		if (self.zigzagTimer % 30 === 0) self.zigzagDir *= -1;
		self.x += self.zigzagDir * 18;
		// Clamp enemy inside left/right screen bounds
		var margin = self.radius;
		if (self.x < margin) self.x = margin;
		if (self.x > GAME_W - margin) self.x = GAME_W - margin;
		self.shootCooldown--;
		// Update health bar
		healthBar.scaleX = 0.95 * (self.health / self.maxHealth);
		if (self.health < 1) healthBar.scaleX = 0;
	};
	self.takeDamage = function (dmg) {
		self.health -= dmg;
		LK.effects.flashObject(self, 0xffe100, 80);
		if (self.health <= 0) self.health = 0;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	// No title, no description
	// Always backgroundColor is black
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
// Game area
// Spaceship (player)
// Player bullet
// Enemy
// Enemy bullet
// Powerup
// Sound effects
// Music
var GAME_W = 2048,
	GAME_H = 2732;
// Score
var score = 0;
var scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var multiplierTxt = new Text2('x1', {
	size: 70,
	fill: 0x00ff88
});
multiplierTxt.anchor.set(0.5, 0);
multiplierTxt.x = scoreTxt.x + 220;
multiplierTxt.y = scoreTxt.y + 40;
LK.gui.top.addChild(multiplierTxt);
// Combo system variables
var comboCount = 0;
var comboTimer = 0;
var lastComboTime = 0;
// Double score powerup
var doubleScoreActive = false;
var doubleScoreTimer = 0;
// Slow motion powerup
var slowMotionActive = false;
var slowMotionTimer = 0;
// Triple shot powerup
var tripleShotActive = false;
var tripleShotTimer = 0;
// Invincibility powerup
var invincibilityActive = false;
var invincibilityTimer = 0;
// Player ship
var ship = new Ship();
game.addChild(ship);
ship.x = GAME_W / 2;
ship.y = GAME_H - 350;
// Arrays for game objects
var playerBullets = [];
var enemies = [];
var enemyBullets = [];
var powerups = [];
// Dragging
var dragNode = null;
// Difficulty (tuned for human reflexes)
// Made easier: enemies spawn less frequently
var enemySpawnTimer = 0;
var enemySpawnInterval = 110; // slower spawn
var minEnemyInterval = 44; // minimum interval increased
var enemySpeedInc = 0;
// Powerup spawn
var powerupTimer = 0;
var powerupInterval = 120; // Powerups much more frequent
// --- Reflex tuning: adjust bullet and enemy speeds globally ---
// Made easier: all speeds reduced, player shoots faster
var PLAYER_BULLET_SPEED = -18; // slower bullet, easier to dodge
var ENEMY_BULLET_SPEED = 9; // slower enemy bullet
var ENEMY_BASE_SPEED = 4.5; // slower base enemy
var ENEMY_FAST_SPEED = 8; // slower fast enemy
var ENEMY_TANK_SPEED = 1.7; // slower tank
var ENEMY_ZIGZAG_SPEED = 5; // slower zigzag
var PLAYER_SHOOT_RATE = 16; // player shoots more often
// Last intersect states
var lastShipEnemyIntersect = false;
var lastShipEnemyBulletIntersect = false;
var lastShipPowerupIntersect = false;
// Music
LK.playMusic('bgmusic');
// Move handler (drag ship)
function handleMove(x, y, obj) {
	if (dragNode === ship) {
		// Clamp ship inside game area (with margin)
		var margin = 80;
		var nx = Math.max(margin, Math.min(GAME_W - margin, x));
		var ny = Math.max(margin, Math.min(GAME_H - margin, y));
		ship.x = nx;
		ship.y = ny;
		// Touch feedback: scale ship up slightly while dragging, then back
		ship.scale.set(1.15, 1.15);
		tween(ship.scale, {
			x: 1,
			y: 1
		}, {
			duration: 120
		});
	}
}
game.move = handleMove;
var dragAnywhereHintShown = false;
game.down = function (x, y, obj) {
	// User-friendly: allow drag to start if touch is on ship OR anywhere in lower half of screen
	var dx = x - ship.x,
		dy = y - ship.y;
	var onShip = dx * dx + dy * dy < ship.radius * ship.radius * 1.2;
	var inLowerHalf = y > GAME_H / 2;
	if (onShip || inLowerHalf) {
		dragNode = ship;
		handleMove(x, y, obj);
		// Visual feedback: flash ship blue for 120ms on drag start
		LK.effects.flashObject(ship, 0x33c1ff, 120);
		// Show floating helper text only the first time user drags from lower half (not on ship)
		if (!onShip && inLowerHalf && !dragAnywhereHintShown) {
			showFloatingText("Tip: Drag anywhere below to move!", ship.x, ship.y - 180, 0x33c1ff);
			dragAnywhereHintShown = true;
		}
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Main update loop
game.update = function () {
	// Update ship
	ship.update();
	// --- Double Score timer ---
	if (doubleScoreActive) {
		doubleScoreTimer--;
		if (doubleScoreTimer <= 0) {
			doubleScoreActive = false;
			showFloatingText("Double Score Ended", ship.x, ship.y - 120, 0xff00ff);
		}
	}
	// --- Slow Motion timer ---
	if (slowMotionActive) {
		slowMotionTimer--;
		if (slowMotionTimer <= 0) {
			slowMotionActive = false;
			showFloatingText("Speed Restored", ship.x, ship.y - 120, 0x8888ff);
		}
	}
	// --- Triple Shot timer ---
	if (tripleShotActive) {
		tripleShotTimer--;
		if (tripleShotTimer <= 0) {
			tripleShotActive = false;
			showFloatingText("Triple Shot Ended", ship.x, ship.y - 120, 0xff8800);
		}
	}
	// --- Invincibility timer ---
	if (invincibilityActive) {
		invincibilityTimer--;
		if (invincibilityTimer <= 0) {
			invincibilityActive = false;
			showFloatingText("Invincibility Ended", ship.x, ship.y - 120, 0xffffff);
		}
	}
	// --- Player shooting ---
	ship.shootCooldown--;
	var shootRate = ship.rapidFire ? Math.max(6, Math.floor(PLAYER_SHOOT_RATE * 0.33)) : PLAYER_SHOOT_RATE;
	if (ship.shootCooldown <= 0) {
		// Auto-fire
		if (tripleShotActive) {
			for (var ts = -1; ts <= 1; ts++) {
				var pb = new PlayerBullet();
				pb.x = ship.x + ts * 38;
				pb.y = ship.y - ship.radius - 30;
				if (ts !== 0) pb.rotation = ts * 0.18;
				playerBullets.push(pb);
				game.addChild(pb);
			}
		} else {
			var pb = new PlayerBullet();
			pb.x = ship.x;
			pb.y = ship.y - ship.radius - 30;
			playerBullets.push(pb);
			game.addChild(pb);
		}
		ship.shootCooldown = shootRate;
		LK.getSound('shoot').play();
	}
	// --- Update player bullets ---
	for (var i = playerBullets.length - 1; i >= 0; i--) {
		var b = playerBullets[i];
		b.update();
		// Remove if off screen
		if (b.y < -80) {
			b.destroy();
			playerBullets.splice(i, 1);
		}
	}
	// --- Update enemies ---
	for (var i = enemies.length - 1; i >= 0; i--) {
		var e = enemies[i];
		// --- Enemy AI: dodge if player is close horizontally ---
		if (Math.abs(ship.x - e.x) < 180 && Math.abs(ship.y - e.y) < 600) {
			// Try to dodge left or right, but less distance for fairness
			if (ship.x < e.x) e.x += 6 + Math.random() * 3;else e.x -= 6 + Math.random() * 3;
		}
		// Slow motion: update less frequently
		if (!slowMotionActive || LK.ticks % 2 === 0) {
			e.update();
		}
		// Destroy and remove enemies when they move off the bottom of the screen
		if (e.y > GAME_H + e.radius) {
			e.destroy();
			enemies.splice(i, 1);
			continue;
		}
		// (Removed clamping: enemies can now leave the screen at the bottom)
		// Enemy shooting
		if (e.shootCooldown <= 0) {
			var eb = new EnemyBullet();
			eb.x = e.x;
			eb.y = e.y + e.radius + 10;
			// Aim at ship
			var dx = ship.x - e.x,
				dy = ship.y - e.y;
			var len = Math.sqrt(dx * dx + dy * dy);
			if (len > 0) {
				eb.dirX = dx / len;
				eb.dirY = dy / len;
			}
			enemyBullets.push(eb);
			game.addChild(eb);
			e.shootCooldown = 90 + Math.floor(Math.random() * 60);
		}
	}
	// --- Update enemy bullets ---
	for (var i = enemyBullets.length - 1; i >= 0; i--) {
		var eb = enemyBullets[i];
		// Slow motion: update less frequently
		if (!slowMotionActive || LK.ticks % 2 === 0) {
			eb.update();
		}
		if (eb.x < -100 || eb.x > GAME_W + 100 || eb.y < -100 || eb.y > GAME_H + 100) {
			eb.destroy();
			enemyBullets.splice(i, 1);
		}
	}
	// --- Update powerups ---
	for (var i = powerups.length - 1; i >= 0; i--) {
		var p = powerups[i];
		p.update();
		if (p.y > GAME_H + 100) {
			p.destroy();
			powerups.splice(i, 1);
		}
	}
	// --- Collision: Player bullets vs Enemies ---
	for (var i = playerBullets.length - 1; i >= 0; i--) {
		var b = playerBullets[i];
		for (var j = enemies.length - 1; j >= 0; j--) {
			var e = enemies[j];
			if (b.intersects(e)) {
				// Hit enemy
				e.takeDamage(1);
				// Recoil effect for enemy
				tween(e, {
					y: e.y - 30
				}, {
					duration: 60,
					yoyo: true,
					repeat: 1
				});
				// Camera shake on hit (simulate with quick flash)
				LK.getSound('enemyDown').play();
				// Combo system variables (global scope, but initialize if undefined)
				if (typeof comboCount === "undefined") comboCount = 0;
				if (typeof comboTimer === "undefined") comboTimer = 0;
				if (typeof lastComboTime === "undefined") lastComboTime = 0;
				// Score only if enemy dies
				if (e.health <= 0) {
					// Combo logic: if last kill was within 2 seconds, increase combo
					var now = LK.ticks;
					if (now - lastComboTime < 120) {
						comboCount++;
					} else {
						comboCount = 1;
					}
					lastComboTime = now;
					comboTimer = 120; // 2 seconds to continue combo
					// Combo bonus: +10 base, +5 per combo after first, multiplied by scoreMultiplier
					if (typeof scoreMultiplier === "undefined") scoreMultiplier = 1;
					var comboBonus = 10 + (comboCount > 1 ? (comboCount - 1) * 5 : 0);
					if (doubleScoreActive) comboBonus *= 2;
					comboBonus *= scoreMultiplier;
					score += comboBonus;
					// Animate score text for feedback
					scoreTxt.setText(score);
					if (typeof multiplierTxt !== "undefined") {
						multiplierTxt.setText("x" + scoreMultiplier);
						multiplierTxt.scale.set(1.3, 1.3);
						tween(multiplierTxt.scale, {
							x: 1,
							y: 1
						}, {
							duration: 200
						});
					}
					scoreTxt.scale.set(1.25, 1.25);
					tween(scoreTxt.scale, {
						x: 1,
						y: 1
					}, {
						duration: 200
					});
					// Show floating text for combo
					if (comboCount > 1) {
						showFloatingText("Combo x" + comboCount + "! +" + comboBonus, e.x, e.y - 80, 0xffe100);
						if (comboCount % 3 === 0) {
							showFloatingText("Multiplier: x" + scoreMultiplier, e.x, e.y - 160, 0x00ff88);
						}
					} else {
						showFloatingText("+10", e.x, e.y - 80, 0xffffff);
					}
					// Fun: random emoji on enemy kill!
					var emojis = ["🚀", "💥", "✨", "🔥", "😎", "🎉", "🛸", "👾"];
					var emoji = emojis[Math.floor(Math.random() * emojis.length)];
					showFloatingText(emoji, e.x + (Math.random() * 80 - 40), e.y - 120, 0xffffff);
					e.destroy();
					enemies.splice(j, 1);
				}
				b.destroy();
				playerBullets.splice(i, 1);
				break;
			}
		}
	}
	// --- Combo timer update ---
	if (typeof comboTimer !== "undefined" && comboTimer > 0) {
		comboTimer--;
		if (comboTimer === 0) {
			comboCount = 0;
			scoreMultiplier = 1; // Reset multiplier on missed combo
		}
	}
	if (comboCount > 1) {
		scoreMultiplier = 1 + Math.floor(comboCount / 3); // Every 3 combo increases multiplier by 1
	} else {
		scoreMultiplier = 1;
	}
	// --- Collision: Ship vs Enemies ---
	var shipEnemyIntersect = false;
	for (var i = 0; i < enemies.length; i++) {
		var e = enemies[i];
		if (ship.intersects(e)) {
			shipEnemyIntersect = true;
			break;
		}
	}
	if (!lastShipEnemyIntersect && shipEnemyIntersect) {
		if (invincibilityActive) {
			LK.effects.flashObject(ship, 0xffffff, 400);
			showFloatingText("No Damage!", ship.x, ship.y - 120, 0xffffff);
		} else if (ship.shield) {
			// Absorb hit, destroy enemy
			LK.effects.flashObject(ship, 0x00ffff, 400);
			for (var i = 0; i < enemies.length; i++) {
				if (ship.intersects(enemies[i])) {
					enemies[i].destroy();
					enemies.splice(i, 1);
					break;
				}
			}
			ship.shield = false;
			ship.shieldTimer = 0;
			ship.children[1].visible = false;
		} else {
			// Take damage
			ship.takeDamage(2);
			// (Screen flash removed)
			LK.getSound('hit').play();
			if (ship.health <= 0) {
				LK.showGameOver();
				return;
			}
		}
	}
	lastShipEnemyIntersect = shipEnemyIntersect;
	// --- Collision: Ship vs Enemy Bullets ---
	var shipEnemyBulletIntersect = false;
	for (var i = 0; i < enemyBullets.length; i++) {
		var eb = enemyBullets[i];
		if (ship.intersects(eb)) {
			shipEnemyBulletIntersect = true;
			break;
		}
	}
	if (!lastShipEnemyBulletIntersect && shipEnemyBulletIntersect) {
		if (invincibilityActive) {
			LK.effects.flashObject(ship, 0xffffff, 400);
			showFloatingText("No Damage!", ship.x, ship.y - 120, 0xffffff);
		} else if (ship.shield) {
			LK.effects.flashObject(ship, 0x00ffff, 400);
			// Remove bullet
			for (var i = 0; i < enemyBullets.length; i++) {
				if (ship.intersects(enemyBullets[i])) {
					enemyBullets[i].destroy();
					enemyBullets.splice(i, 1);
					break;
				}
			}
			ship.shield = false;
			ship.shieldTimer = 0;
			ship.children[1].visible = false;
		} else {
			// Take damage
			ship.takeDamage(1);
			// (Screen flash removed)
			LK.getSound('hit').play();
			if (ship.health <= 0) {
				LK.showGameOver();
				return;
			}
		}
	}
	lastShipEnemyBulletIntersect = shipEnemyBulletIntersect;
	// --- Collision: Ship vs Powerups ---
	var shipPowerupIntersect = false;
	for (var i = powerups.length - 1; i >= 0; i--) {
		var p = powerups[i];
		if (ship.intersects(p)) {
			shipPowerupIntersect = true;
			// Apply powerup
			LK.getSound('powerup').play();
			// Fun: confetti burst effect on powerup collect!
			for (var confetti = 0; confetti < 18; confetti++) {
				(function () {
					var part = new Container();
					var c = part.attachAsset('playerBullet', {
						anchorX: 0.5,
						anchorY: 0.5,
						scaleX: 0.4 + Math.random() * 0.5,
						scaleY: 0.4 + Math.random() * 0.5,
						tint: 0xffe100 + Math.floor(Math.random() * 0xffffff)
					});
					part.x = ship.x;
					part.y = ship.y - 40;
					part.alpha = 0.85;
					game.addChild(part);
					var angle = Math.random() * Math.PI * 2;
					var dist = 120 + Math.random() * 80;
					var dx = Math.cos(angle) * dist;
					var dy = Math.sin(angle) * dist;
					tween(part, {
						x: part.x + dx,
						y: part.y + dy,
						alpha: 0
					}, {
						duration: 600 + Math.random() * 400,
						onFinish: function onFinish() {
							part.destroy();
						}
					});
				})();
			}
			// Combo stacking: combine effects if already active, extend duration, and show combo text!
			if (p.type === 'rapid') {
				if (ship.rapidFire) {
					ship.rapidFireTimer += 240; // stack duration
					showFloatingText("Rapid Fire Combo!", ship.x, ship.y - 120, 0xffe100);
				} else {
					ship.activateRapidFire(360);
					showFloatingText("Rapid Fire!", ship.x, ship.y - 120, 0xffe100);
				}
			} else if (p.type === 'shield') {
				if (ship.shield) {
					ship.shieldTimer += 320;
					showFloatingText("Shield Combo!", ship.x, ship.y - 120, 0x00ffff);
				} else {
					ship.activateShield(480);
					showFloatingText("Shield!", ship.x, ship.y - 120, 0x00ffff);
				}
			} else if (p.type === 'heal') {
				ship.heal(4); // Heal more
				showFloatingText("+4 Health", ship.x, ship.y - 120, 0x44ff44);
			} else if (p.type === 'doubleScore') {
				if (doubleScoreActive) {
					doubleScoreTimer += 400;
					showFloatingText("Double Score Combo!", ship.x, ship.y - 120, 0xff00ff);
				} else {
					doubleScoreActive = true;
					doubleScoreTimer = 600;
					showFloatingText("Double Score!", ship.x, ship.y - 120, 0xff00ff);
				}
			} else if (p.type === 'slowMotion') {
				if (slowMotionActive) {
					slowMotionTimer += 300;
					showFloatingText("Slow Motion Combo!", ship.x, ship.y - 120, 0x8888ff);
				} else {
					slowMotionActive = true;
					slowMotionTimer = 420;
					showFloatingText("Slow Motion!", ship.x, ship.y - 120, 0x8888ff);
				}
			} else if (p.type === 'tripleShot') {
				if (tripleShotActive) {
					tripleShotTimer += 360;
					showFloatingText("Triple Shot Combo!", ship.x, ship.y - 120, 0xff8800);
				} else {
					tripleShotActive = true;
					tripleShotTimer = 540;
					showFloatingText("Triple Shot!", ship.x, ship.y - 120, 0xff8800);
				}
			} else if (p.type === 'megaShield') {
				if (ship.shield) {
					ship.shieldTimer += 800;
					showFloatingText("Mega Shield Combo!", ship.x, ship.y - 120, 0x00ff88);
				} else {
					ship.activateShield(1200);
					showFloatingText("Mega Shield!", ship.x, ship.y - 120, 0x00ff88);
				}
			} else if (p.type === 'invincibility') {
				if (invincibilityActive) {
					invincibilityTimer += 240;
					showFloatingText("Invincible Combo!", ship.x, ship.y - 120, 0xffffff);
				} else {
					invincibilityActive = true;
					invincibilityTimer = 360;
					showFloatingText("Invincible!", ship.x, ship.y - 120, 0xffffff);
				}
			}
			// Combo fusion: if multiple effects are active, show a special floating text!
			var comboActiveCount = 0;
			if (ship.rapidFire) comboActiveCount++;
			if (doubleScoreActive) comboActiveCount++;
			if (tripleShotActive) comboActiveCount++;
			if (slowMotionActive) comboActiveCount++;
			if (invincibilityActive) comboActiveCount++;
			if (ship.shield) comboActiveCount++;
			if (comboActiveCount >= 3) {
				showFloatingText("Combo Fusion! (" + comboActiveCount + ")", ship.x, ship.y - 220, 0xffe100);
			}
			p.destroy();
			powerups.splice(i, 1);
		}
	}
	lastShipPowerupIntersect = shipPowerupIntersect;
	// --- Mission system: show floating text for milestones ---
	if (score > 0 && score % 100 === 0 && !game['milestone_' + score]) {
		showFloatingText("Milestone: " + score + "!", GAME_W / 2, 320, 0xffe100);
		game['milestone_' + score] = true;
	}
	// --- Background color cycling every 200 points ---
	// Define a palette of beautiful background colors
	if (typeof bgColors === "undefined") {
		var bgColors = [0x000000,
		// black
		0x1a237e,
		// indigo
		0x004d40,
		// teal dark
		0x263238,
		// blue grey
		0x880e4f,
		// deep pink
		0x1565c0,
		// blue
		0x2e7d32,
		// green
		0xff6f00,
		// orange
		0x4a148c,
		// purple
		0x212121,
		// dark grey
		0x00695c,
		// teal
		0x3949ab,
		// blue indigo
		0xc62828,
		// red
		0x00838f,
		// cyan
		0x6d4c41,
		// brown
		0x283593 // deep blue
		];
		var lastBgColorIndex = 0;
		var lastBgScoreStep = 0;
	}
	// Calculate which color to use based on score
	var bgScoreStep = Math.floor(score / 200);
	if (bgScoreStep !== lastBgScoreStep) {
		// Cycle through palette, skip black after first
		var colorIdx = bgScoreStep % bgColors.length;
		if (colorIdx === 0 && bgScoreStep > 0) colorIdx = 1;
		game.setBackgroundColor(bgColors[colorIdx]);
		lastBgColorIndex = colorIdx;
		lastBgScoreStep = bgScoreStep;
	}
	// --- Feature selection popup removed ---
	// --- Enemy spawn ---
	enemySpawnTimer--;
	if (enemySpawnTimer <= 0) {
		// Randomly pick enemy type
		var enemyTypeRand = Math.random();
		var e;
		if (enemyTypeRand < 0.25) {
			e = new FastEnemy();
		} else if (enemyTypeRand < 0.5) {
			e = new TankEnemy();
		} else if (enemyTypeRand < 0.75) {
			e = new ZigzagEnemy();
		} else {
			e = new Enemy();
		}
		e.x = 180 + Math.random() * (GAME_W - 360);
		e.y = -100;
		// Removed enemy speed scaling with score to keep game speed consistent
		enemies.push(e);
		game.addChild(e);
		// Decrease interval as score increases
		enemySpawnInterval = Math.max(minEnemyInterval, 60 - Math.floor(score / 100) * 4);
		enemySpawnTimer = enemySpawnInterval;
	}
	// --- Powerup spawn ---
	powerupTimer--;
	if (powerupTimer <= 0) {
		var p = new Powerup();
		p.x = 180 + Math.random() * (GAME_W - 360);
		p.y = -80;
		powerups.push(p);
		game.addChild(p);
		powerupInterval = 120 + Math.floor(Math.random() * 120);
		powerupTimer = powerupInterval;
	}
};
// Floating text helper for feedback
function showFloatingText(txt, x, y, color) {
	var t = new Text2(txt, {
		size: 90,
		fill: color || 0xffffff,
		stroke: 0x000000,
		strokeThickness: 8
	});
	t.anchor.set(0.5, 1);
	t.x = x;
	t.y = y;
	game.addChild(t);
	tween(t, {
		y: y - 120,
		alpha: 0
	}, {
		duration: 700,
		onFinish: function onFinish() {
			t.destroy();
		}
	});
}
// Show instructions at game start
var instructionTxt = new Text2("Drag the ship to move\nAuto-fire enabled\nCollect powerups!", {
	size: 90,
	fill: 0xffffff,
	stroke: 0x000000,
	strokeThickness: 8,
	align: "center"
});
instructionTxt.anchor.set(0.5, 0.5);
instructionTxt.x = GAME_W / 2;
instructionTxt.y = GAME_H / 2 - 200;
game.addChild(instructionTxt);
tween(instructionTxt, {
	alpha: 0
}, {
	duration: 1800,
	onFinish: function onFinish() {
		instructionTxt.destroy();
	}
});