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

/**** 
* Classes
****/ 
// Asteroid
var Asteroid = Container.expand(function () {
	var self = Container.call(this);
	var rock = self.attachAsset('asteroid', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = rock.width;
	self.height = rock.height;
	self.speed = 10 + Math.random() * 6;
	self.rotationSpeed = (Math.random() - 0.5) * 0.1;
	self.update = function () {
		self.y += self.speed;
		rock.rotation += self.rotationSpeed;
	};
	return self;
});
// Enemy Bullet
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var bullet = self.attachAsset('enemyBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = bullet.width;
	self.height = bullet.height;
	self.speed = 22;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Enemy Ship
var EnemyShip = Container.expand(function () {
	var self = Container.call(this);
	var ship = self.attachAsset('enemyShip', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = ship.width;
	self.height = ship.height;
	self.speed = 7 + Math.random() * 4;
	self.shootCooldown = 60 + Math.floor(Math.random() * 60);
	self.update = function () {
		self.y += self.speed;
		if (self.shootCooldown > 0) {
			self.shootCooldown--;
		} else {
			self.shoot();
			self.shootCooldown = 90 + Math.floor(Math.random() * 60);
		}
	};
	self.shoot = function () {
		var bullet = new EnemyBullet();
		bullet.x = self.x;
		bullet.y = self.y + self.height / 2 + bullet.height / 2;
		enemyBullets.push(bullet);
		game.addChild(bullet);
	};
	return self;
});
// Player Bullet
var PlayerBullet = Container.expand(function () {
	var self = Container.call(this);
	var bullet = self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = bullet.width;
	self.height = bullet.height;
	self.speed = -36;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Player Ship
var PlayerShip = Container.expand(function () {
	var self = Container.call(this);
	var ship = self.attachAsset('playerShip', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = ship.width;
	self.height = ship.height;
	self.shootCooldown = 0;
	self.invincible = false;
	self.invincibleTicks = 0;
	self.update = function () {
		if (self.shootCooldown > 0) self.shootCooldown--;
		if (self.invincible) {
			self.invincibleTicks--;
			if (self.invincibleTicks <= 0) {
				self.invincible = false;
				ship.alpha = 1;
			} else {
				// Flicker effect
				ship.alpha = LK.ticks % 10 < 5 ? 0.4 : 1;
			}
		}
	};
	// Shoot method
	self.shoot = function () {
		if (self.shootCooldown <= 0) {
			var bullet = new PlayerBullet();
			bullet.x = self.x;
			bullet.y = self.y - self.height / 2 - bullet.height / 2;
			playerBullets.push(bullet);
			game.addChild(bullet);
			LK.getSound('shoot').play();
			self.shootCooldown = 12; // 12 ticks cooldown
		}
	};
	// Invincibility after hit
	self.setInvincible = function (ticks) {
		self.invincible = true;
		self.invincibleTicks = ticks;
	};
	// Add down handler so clicking the ship makes it shoot
	self.down = function (x, y, obj) {
		// Only allow shooting if game is not over
		if (typeof gameOver !== "undefined" && !gameOver) {
			self.shoot();
		}
	};
	return self;
});
// Powerup
var Powerup = Container.expand(function () {
	var self = Container.call(this);
	var p = self.attachAsset('powerup', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = p.width;
	self.height = p.height;
	self.speed = 9;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000010
});

/**** 
* Game Code
****/ 
// Music
// Sounds
// Explosion effect (for flash)
// Power-up
// Asteroid
// Enemy bullet
// Enemy ship
// Player bullet
// Spaceship (player)
// Play background music
LK.playMusic('galacticMusic');
// Game variables
var player;
var playerBullets = [];
var enemyShips = [];
var enemyBullets = [];
var asteroids = [];
var powerups = [];
var score = 0;
var lives = 3;
var level = 1;
var spawnTick = 0;
var asteroidTick = 0;
var powerupTick = 0;
var dragging = false;
var dragOffsetX = 0;
var dragOffsetY = 0;
var lastTouchX = 0;
var lastTouchY = 0;
var gameOver = false;
// Score display
var scoreTxt = new Text2('0', {
	size: 100,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Lives display
var livesTxt = new Text2('♥♥♥', {
	size: 80,
	fill: 0xFF6666
});
livesTxt.anchor.set(1, 0);
LK.gui.topRight.addChild(livesTxt);
// Center player at bottom center
player = new PlayerShip();
player.x = 2048 / 2;
player.y = 2732 - 300;
game.addChild(player);
// Touch controls
game.down = function (x, y, obj) {
	if (gameOver) return;
	// Only start drag if touch is on player
	var local = player.toLocal(game.toGlobal({
		x: x,
		y: y
	}));
	if (local.x > -player.width / 2 && local.x < player.width / 2 && local.y > -player.height / 2 && local.y < player.height / 2) {
		dragging = true;
		dragOffsetX = player.x - x;
		dragOffsetY = player.y - y;
	}
	lastTouchX = x;
	lastTouchY = y;
};
game.move = function (x, y, obj) {
	if (gameOver) return;
	// Make the player ship follow the mouse/touch position directly, clamped to screen bounds
	var halfW = player.width / 2;
	var halfH = player.height / 2;
	var newX = x;
	var newY = y;
	if (newX < halfW) newX = halfW;
	if (newX > 2048 - halfW) newX = 2048 - halfW;
	if (newY < halfH + 200) newY = halfH + 200; // Don't allow too high
	if (newY > 2732 - halfH) newY = 2732 - halfH;
	player.x = newX;
	player.y = newY;
	lastTouchX = x;
	lastTouchY = y;
};
game.up = function (x, y, obj) {
	dragging = false;
	lastTouchX = x;
	lastTouchY = y;
};
// Tap to shoot (anywhere)
game.tap = function (x, y, obj) {
	if (gameOver) return;
	player.shoot();
};
// For compatibility, also allow shooting on down if not dragging
game.down = function (origDown) {
	return function (x, y, obj) {
		origDown(x, y, obj);
		if (!dragging && !gameOver) {
			player.shoot();
		}
	};
}(game.down);
// Main update loop
game.update = function () {
	if (gameOver) return;
	// Update player
	player.update();
	// 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 < -b.height) {
			b.destroy();
			playerBullets.splice(i, 1);
			continue;
		}
		// Check collision with enemies
		for (var j = enemyShips.length - 1; j >= 0; j--) {
			var e = enemyShips[j];
			if (b.intersects(e)) {
				// Destroy enemy
				LK.getSound('enemyExplode').play();
				score += 100;
				scoreTxt.setText(score);
				// Flash enemy
				LK.effects.flashObject(e, 0xffffff, 200);
				e.destroy();
				enemyShips.splice(j, 1);
				// Remove bullet
				b.destroy();
				playerBullets.splice(i, 1);
				break;
			}
		}
		// Check collision with asteroids
		for (var k = asteroids.length - 1; k >= 0; k--) {
			var a = asteroids[k];
			if (b.intersects(a)) {
				// Destroy asteroid
				LK.getSound('enemyExplode').play();
				score += 50;
				scoreTxt.setText(score);
				LK.effects.flashObject(a, 0xffffff, 150);
				a.destroy();
				asteroids.splice(k, 1);
				// Remove bullet
				b.destroy();
				playerBullets.splice(i, 1);
				break;
			}
		}
	}
	// Update enemy ships
	for (var i = enemyShips.length - 1; i >= 0; i--) {
		var e = enemyShips[i];
		e.update();
		// Remove if off screen
		if (e.y > 2732 + e.height) {
			e.destroy();
			enemyShips.splice(i, 1);
			continue;
		}
		// Check collision with player
		if (!player.invincible && e.intersects(player)) {
			handlePlayerHit();
			e.destroy();
			enemyShips.splice(i, 1);
			continue;
		}
	}
	// Update enemy bullets
	for (var i = enemyBullets.length - 1; i >= 0; i--) {
		var b = enemyBullets[i];
		b.update();
		if (b.y > 2732 + b.height) {
			b.destroy();
			enemyBullets.splice(i, 1);
			continue;
		}
		if (!player.invincible && b.intersects(player)) {
			handlePlayerHit();
			b.destroy();
			enemyBullets.splice(i, 1);
			continue;
		}
	}
	// Update asteroids
	for (var i = asteroids.length - 1; i >= 0; i--) {
		var a = asteroids[i];
		a.update();
		if (a.y > 2732 + a.height) {
			a.destroy();
			asteroids.splice(i, 1);
			continue;
		}
		if (!player.invincible && a.intersects(player)) {
			handlePlayerHit();
			a.destroy();
			asteroids.splice(i, 1);
			continue;
		}
	}
	// Update powerups
	for (var i = powerups.length - 1; i >= 0; i--) {
		var p = powerups[i];
		p.update();
		if (p.y > 2732 + p.height) {
			p.destroy();
			powerups.splice(i, 1);
			continue;
		}
		if (p.intersects(player)) {
			LK.getSound('powerup').play();
			score += 250;
			scoreTxt.setText(score);
			// Grant temporary invincibility
			player.setInvincible(120);
			p.destroy();
			powerups.splice(i, 1);
			continue;
		}
	}
	// Spawning logic
	spawnTick++;
	asteroidTick++;
	powerupTick++;
	// Enemy spawn
	var enemyInterval = Math.max(60, 180 - level * 10);
	if (spawnTick >= enemyInterval) {
		spawnTick = 0;
		var e = new EnemyShip();
		e.x = 200 + Math.random() * (2048 - 400);
		e.y = -e.height;
		enemyShips.push(e);
		game.addChild(e);
	}
	// Asteroid spawn
	var asteroidInterval = Math.max(80, 220 - level * 8);
	if (asteroidTick >= asteroidInterval) {
		asteroidTick = 0;
		var a = new Asteroid();
		a.x = 100 + Math.random() * (2048 - 200);
		a.y = -a.height;
		asteroids.push(a);
		game.addChild(a);
	}
	// Powerup spawn
	if (powerupTick >= 900) {
		powerupTick = 0;
		var p = new Powerup();
		p.x = 200 + Math.random() * (2048 - 400);
		p.y = -p.height;
		powerups.push(p);
		game.addChild(p);
	}
	// Level up every 1000 points
	var newLevel = Math.floor(score / 1000) + 1;
	if (newLevel > level) {
		level = newLevel;
		// Optionally, flash screen or show level up
		LK.effects.flashScreen(0x00ffcc, 400);
	}
};
// Handle player hit
function handlePlayerHit() {
	if (player.invincible) return;
	lives--;
	updateLivesDisplay();
	LK.getSound('playerExplode').play();
	LK.effects.flashScreen(0xff0000, 600);
	player.setInvincible(90);
	if (lives <= 0) {
		endGame();
	}
}
// Update lives display
function updateLivesDisplay() {
	var s = '';
	for (var i = 0; i < lives; i++) s += '♥';
	livesTxt.setText(s);
}
// End game
function endGame() {
	gameOver = true;
	LK.showGameOver();
}
// Reset game state on restart
game.on('reset', function () {
	// Remove all objects
	for (var i = 0; i < playerBullets.length; i++) playerBullets[i].destroy();
	for (var i = 0; i < enemyShips.length; i++) enemyShips[i].destroy();
	for (var i = 0; i < enemyBullets.length; i++) enemyBullets[i].destroy();
	for (var i = 0; i < asteroids.length; i++) asteroids[i].destroy();
	for (var i = 0; i < powerups.length; i++) powerups[i].destroy();
	playerBullets = [];
	enemyShips = [];
	enemyBullets = [];
	asteroids = [];
	powerups = [];
	score = 0;
	level = 1;
	lives = 3;
	spawnTick = 0;
	asteroidTick = 0;
	powerupTick = 0;
	dragging = false;
	gameOver = false;
	scoreTxt.setText('0');
	updateLivesDisplay();
	player.x = 2048 / 2;
	player.y = 2732 - 300;
	player.invincible = false;
	player.invincibleTicks = 0;
	LK.playMusic('galacticMusic');
});
// For touch devices, allow tap to shoot
game.on('tap', function (x, y, obj) {
	if (gameOver) return;
	player.shoot();
});

===================================================================
--- original.js
+++ change.js