/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");
var storage = LK.import("@upit/storage.v1", {
	currency: 0,
	unlockedSkins: ["default"],
	selectedSkin: "default",
	upgrades: {
		fireRate: 0,
		speed: 0,
		health: 0
	}
});

/**** 
* Classes
****/ 
// CoinDrop: Collectible coin that moves down and can be picked up by the player
var CoinDrop = Container.expand(function () {
	var self = Container.call(this);
	var asset = self.attachAsset('coin', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 1.1,
		scaleY: 1.1
	});
	self.width = asset.width;
	self.height = asset.height;
	self.speed = 7;
	self.lastWasIntersecting = false;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Enemy Base Class
var EnemyBase = Container.expand(function () {
	var self = Container.call(this);
	self.type = 'base';
	self.scoreValue = 1;
	self.health = 1;
	self.shootCooldown = 0;
	self.shootRate = 90;
	self.speed = 4;
	self.bulletSpeed = 12;
	self.lastIntersecting = false;
	self.lastY = 0;
	self.takeDamage = function (amount) {
		self.health -= amount;
		if (self.health <= 0) {
			LK.getSound('enemyExplode').play();
			LK.effects.flashObject(self, 0xffff00, 400); // Explosion effect (yellow flash)
			LK.setScore(LK.getScore() + self.scoreValue);
			addCurrency(self.scoreValue);
			showScorePopup(self.x, self.y, self.scoreValue);
			// Spawn debris parts
			for (var i = 0; i < 8; i++) {
				var part = new EnemyPart();
				part.x = self.x;
				part.y = self.y;
				game.addChild(part);
				enemyParts.push(part);
			}
			// Only CoinEnemy drops a coin, so do not drop a coin here for base enemies
			self.destroy();
			return true;
		}
		return false;
	};
	self.shoot = function () {
		if (self.shootCooldown > 0) return;
		var bullet = new EnemyBullet();
		bullet.x = self.x;
		bullet.y = self.y + self.height / 2;
		// If this is a green enemy, make its bullets faster
		if (self.type === 'green') {
			bullet.speed = 14;
		}
		enemyBullets.push(bullet);
		game.addChild(bullet);
		LK.getSound('enemyShoot').play();
		self.shootCooldown = self.shootRate;
	};
	self.update = function () {
		self.y += self.speed;
		if (self.shootCooldown > 0) self.shootCooldown--;
	};
	return self;
});
// Red Attacker: moves straight, shoots at player
var EnemyRed = EnemyBase.expand(function () {
	var self = EnemyBase.call(this);
	self.type = 'red';
	self.scoreValue = 2;
	self.health = 1;
	self.shootRate = 80;
	self.speed = 6;
	self.asset = self.attachAsset('enemyRed', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = self.asset.width;
	self.height = self.asset.height;
	self.update = function () {
		self.y += self.speed;
		if (self.shootCooldown > 0) self.shootCooldown--;
		// Shoot if player is roughly aligned
		if (Math.abs(self.x - player.x) < 80 && self.shootCooldown <= 0) {
			self.shoot();
		}
	};
	return self;
});
// Green Tank: slow, high health, shoots
var EnemyGreen = EnemyBase.expand(function () {
	var self = EnemyBase.call(this);
	self.type = 'green';
	self.scoreValue = 5;
	self.health = 3; // reduced from 6 to 3
	self.shootRate = 60;
	self.speed = 3.5;
	self.asset = self.attachAsset('enemyGreen', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = self.asset.width;
	self.height = self.asset.height;
	self.update = function () {
		self.y += self.speed;
		if (self.shootCooldown > 0) self.shootCooldown--;
		// Shoots more often
		if (self.shootCooldown <= 0) {
			self.shoot();
		}
	};
	return self;
});
// Blue Speedster: zig-zags, no shooting
var EnemyBlue = EnemyBase.expand(function () {
	var self = EnemyBase.call(this);
	self.type = 'blue';
	self.scoreValue = 3;
	self.health = 1;
	self.shootRate = 9999;
	self.speed = 8;
	self.asset = self.attachAsset('enemyBlue', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = self.asset.width;
	self.height = self.asset.height;
	self.zigzagDir = Math.random() > 0.5 ? 1 : -1;
	self.zigzagSpeed = 7 + Math.random() * 3;
	self.zigzagPhase = Math.random() * 100;
	self.update = function () {
		self.y += self.speed;
		self.x += Math.sin((LK.ticks + self.zigzagPhase) / 18) * self.zigzagSpeed * self.zigzagDir;
	};
	return self;
});
// CoinEnemy: Enemies that carry a coin and drop it when destroyed
var CoinEnemy = EnemyBase.expand(function () {
	var self = EnemyBase.call(this);
	self.type = 'coin';
	self.scoreValue = 2;
	self.health = 1;
	self.shootRate = 120;
	self.speed = 5;
	self.asset = self.attachAsset('enemyRed', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = self.asset.width;
	self.height = self.asset.height;
	// Add a coin icon on top of the enemy
	self.coinIcon = self.attachAsset('coin', {
		anchorX: 0.5,
		anchorY: 1.2,
		scaleX: 0.7,
		scaleY: 0.7
	});
	// Override takeDamage to drop a coin
	self.takeDamage = function (amount) {
		self.health -= amount;
		if (self.health <= 0) {
			LK.getSound('enemyExplode').play();
			LK.effects.flashObject(self, 0xffff00, 400); // Explosion effect (yellow flash)
			LK.setScore(LK.getScore() + self.scoreValue);
			showScorePopup(self.x, self.y, self.scoreValue);
			// Spawn debris parts
			for (var i = 0; i < 8; i++) {
				var part = new EnemyPart();
				part.x = self.x;
				part.y = self.y;
				game.addChild(part);
				enemyParts.push(part);
			}
			// Drop a coin at this position, but only once
			if (!self._coinDropped) {
				var coin = new CoinDrop();
				coin.x = self.x;
				coin.y = self.y;
				coinDrops.push(coin);
				game.addChild(coin);
				self._coinDropped = true;
			}
			self.destroy();
			return true;
		}
		return false;
	};
	self.update = function () {
		self.y += self.speed;
		if (self.shootCooldown > 0) self.shootCooldown--;
	};
	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 = 8;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// EnemyPart: Debris piece for enemy explosion
var EnemyPart = Container.expand(function () {
	var self = Container.call(this);
	// Use a greenCube for debris, but only red and orange colors
	var colors = [0xff4444, 0xff9900];
	var color = colors[Math.floor(Math.random() * colors.length)];
	var part = self.attachAsset('greenCube', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	part.tint = color;
	// Randomize size
	var scale = 0.4 + Math.random() * 0.5;
	part.scaleX = scale;
	part.scaleY = scale;
	self.width = part.width * scale;
	self.height = part.height * scale;
	// Set initial velocity
	self.vx = (Math.random() - 0.5) * 32;
	self.vy = (Math.random() - 0.5) * 32 - 8;
	self.gravity = 2.2 + Math.random() * 0.8;
	self.life = 36 + Math.floor(Math.random() * 18); // 0.6s
	self._age = 0;
	self.update = function () {
		self.x += self.vx;
		self.y += self.vy;
		self.vy += self.gravity;
		self._age++;
		// Fade out
		part.alpha = Math.max(0, 1 - self._age / self.life);
		if (self._age > self.life) {
			self.destroy();
		}
	};
	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 = -8 - (storage.upgrades && storage.upgrades.fireRate ? storage.upgrades.fireRate * 1 : 0); // Slowed down from -12 to -8
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Player Plane
var PlayerPlane = Container.expand(function () {
	var self = Container.call(this);
	// Attach player plane asset
	self.skin = storage.selectedSkin || 'default';
	self.plane = self.attachAsset('playerPlane', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = self.plane.width;
	self.height = self.plane.height;
	self.fireCooldown = 0;
	self.baseFireRate = 30; // ticks between shots
	self.baseSpeed = 32; // Increased from 23 for faster movement
	self.baseHealth = 8; // Increased from 5 to 8 for more player lives
	self.maxHealth = self.baseHealth + (storage.upgrades && storage.upgrades.health ? storage.upgrades.health : 0);
	self.health = self.maxHealth;
	self.updateSkin = function () {
		// For future: swap asset based on skin
		// For now, only color changes
		if (self.skin === 'default') {
			self.plane.tint = 0x888888;
		} else if (self.skin === 'gold') {
			self.plane.tint = 0xffd700;
		} else if (self.skin === 'blue') {
			self.plane.tint = 0x2a6edb;
		}
	};
	self.shoot = function () {
		if (self.fireCooldown > 0) return;
		var bullet = new PlayerBullet();
		bullet.x = self.x;
		bullet.y = self.y - self.height / 2 + 10;
		playerBullets.push(bullet);
		game.addChild(bullet);
		LK.getSound('playerShoot').play();
		self.fireCooldown = self.baseFireRate - (storage.upgrades && storage.upgrades.fireRate ? storage.upgrades.fireRate * 4 : 0);
		if (self.fireCooldown < 8) self.fireCooldown = 8;
	};
	self.takeDamage = function (amount) {
		self.health -= amount;
		if (self.health < 0) self.health = 0;
		LK.effects.flashObject(self, 0xff0000, 200);
		LK.getSound('playerHit').play();
		updateHealthBar();
		if (self.health <= 0) {
			LK.effects.flashScreen(0xff0000, 800);
			LK.showGameOver();
		}
	};
	self.heal = function (amount) {
		self.health += amount;
		if (self.health > self.maxHealth) self.health = self.maxHealth;
		updateHealthBar();
	};
	self.update = function () {
		if (self.fireCooldown > 0) self.fireCooldown--;
	};
	self.updateSkin();
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundImage: 'spaceMoonBg'
});

/**** 
* Game Code
****/ 
// Music
// Sounds
// Coin icon
// Health bar foreground
// Health bar background
// Enemy bullet (red)
// Enemy: Green Tank
// Enemy: Blue Speedster
// Enemy: Red Attacker
// Player bullet (yellow)
// Player plane (default skin: gray)
// --- Global Variables ---
var player;
var playerBullets = [];
var enemies = [];
var enemyBullets = [];
var coinDrops = [];
var enemyParts = [];
var spawnTimer = 0;
var spawnInterval = 60;
var dragNode = null;
var lastPlayerX = 0;
var lastPlayerY = 0;
var healthBarBg, healthBarFg;
var scoreTxt, coinTxt, coinIcon;
var currency = storage.currency || 0;
// Track how many enemies have been destroyed for health bonus
var enemiesDestroyedSinceLastHeal = 0;
// --- GUI Elements ---
// --- Start Screen State ---
var gameState = "start"; // "start", "playing", "market"
var startScreenContainer = new Container();
startScreenContainer.width = 2048;
startScreenContainer.height = 2732;
// --- Start Screen Background ---
// 2D sunny forest background
var startBg = LK.getAsset('forestBg', {
	anchorX: 0,
	anchorY: 0,
	scaleX: 2048 / 600,
	scaleY: 2732 / 40,
	x: 0,
	y: 0
});
startBg.width = 2048;
startBg.height = 2732;
startScreenContainer.addChild(startBg);
// --- Top Right Coin Display (for start/market screens) ---
var coinIconTL = LK.getAsset('coin', {
	anchorX: 0.5,
	anchorY: 0.5
});
coinIconTL.x = 2048 - 160;
coinIconTL.y = 120;
startScreenContainer.addChild(coinIconTL);
var coinTxtTL = new Text2(currency + '', {
	size: 80,
	fill: 0xFFD700
});
coinTxtTL.anchor.set(0, 0.5);
coinTxtTL.x = 2048 - 120;
coinTxtTL.y = 120;
startScreenContainer.addChild(coinTxtTL);
// --- Start Screen Title ---
var titleTxt = new Text2("Uçak Savaşı", {
	size: 160,
	fill: "#fff"
});
titleTxt.anchor.set(0.5, 0.5);
titleTxt.x = 2048 / 2;
titleTxt.y = 700;
startScreenContainer.addChild(titleTxt);
// --- Start Button ---
var startBtn = LK.getAsset('playerPlane', {
	anchorX: 0.5,
	anchorY: 0.5
});
startBtn.x = 2048 / 2;
startBtn.y = 1200;
startBtn.scaleX = 1.2;
startBtn.scaleY = 1.2;
startScreenContainer.addChild(startBtn);
var startBtnTxt = new Text2("Başla", {
	size: 100,
	fill: "#fff"
});
startBtnTxt.anchor.set(0.5, 0.5);
startBtnTxt.x = startBtn.x;
startBtnTxt.y = startBtn.y + 180;
startScreenContainer.addChild(startBtnTxt);
// --- Add start screen to game ---
game.addChild(startScreenContainer);
// --- Hide game GUI until game starts ---
function setGameGuiVisible(visible) {
	if (typeof scoreTxt !== "undefined" && scoreTxt) scoreTxt.visible = visible;
	if (typeof coinIconBL !== "undefined" && coinIconBL) coinIconBL.visible = visible;
	if (typeof coinTxtBL !== "undefined" && coinTxtBL) coinTxtBL.visible = visible;
	if (typeof coinIcon !== "undefined" && coinIcon) coinIcon.visible = visible;
	if (typeof coinTxt !== "undefined" && coinTxt) coinTxt.visible = visible;
	if (typeof healthBarBg !== "undefined" && healthBarBg) healthBarBg.visible = visible;
	if (typeof healthBarFg !== "undefined" && healthBarFg) healthBarFg.visible = visible;
}
setGameGuiVisible(false);
// --- GUI for in-game (unchanged) ---
scoreTxt = new Text2('0', {
	size: 100,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Coin GUI for bottom left
var coinIconBL = LK.getAsset('coin', {
	anchorX: 0.5,
	anchorY: 0.5
});
coinIconBL.x = 80;
coinIconBL.y = -80;
LK.gui.bottomLeft.addChild(coinIconBL);
var coinTxtBL = new Text2(currency + '', {
	size: 80,
	fill: 0xFFD700
});
coinTxtBL.anchor.set(0, 0.5);
coinTxtBL.x = 120;
coinTxtBL.y = -80;
LK.gui.bottomLeft.addChild(coinTxtBL);
// (Retain top right coin for reference, but main is bottom left)
coinIcon = LK.getAsset('coin', {
	anchorX: 0.5,
	anchorY: 0.5
});
coinIcon.x = 0;
coinIcon.y = 0;
LK.gui.topRight.addChild(coinIcon);
coinTxt = new Text2(currency + '', {
	size: 80,
	fill: 0xFFD700
});
coinTxt.anchor.set(0, 0.5);
coinTxt.x = 40;
coinTxt.y = 0;
LK.gui.topRight.addChild(coinTxt);
// Health bar
healthBarBg = LK.getAsset('healthBarBg', {
	anchorX: 0,
	anchorY: 0.5
});
healthBarBg.x = 200;
healthBarBg.y = 120;
LK.gui.top.addChild(healthBarBg);
healthBarFg = LK.getAsset('healthBarFg', {
	anchorX: 0,
	anchorY: 0.5
});
healthBarFg.x = 200;
healthBarFg.y = 120;
LK.gui.top.addChild(healthBarFg);
function updateHealthBar() {
	var ratio = player.health / player.maxHealth;
	if (ratio < 0) ratio = 0;
	healthBarFg.width = 600 * ratio;
}
// --- Player Initialization ---
player = new PlayerPlane();
player.x = 2048 / 2;
player.y = 2732 - 350;
game.addChild(player);
// Set initial follow target to player's starting position
game._lastMoveX = player.x;
game._lastMoveY = player.y;
updateHealthBar();
// --- Show/Hide Screens ---
function showStartScreen() {
	gameState = "start";
	startScreenContainer.visible = true;
	// marketScreenContainer.visible = false;//{3P}  // Removed: marketScreenContainer is not defined
	setGameGuiVisible(false);
	player.visible = false;
	coinTxtTL.setText(currency + '');
}
function startGame() {
	gameState = "playing";
	startScreenContainer.visible = false;
	// marketScreenContainer.visible = false;//{3T}  // Removed: marketScreenContainer is not defined
	setGameGuiVisible(true);
	player.visible = true;
	// Reset player position and health
	player.x = 2048 / 2;
	player.y = 2732 - 350;
	player.maxHealth = player.baseHealth + (storage.upgrades && storage.upgrades.health ? storage.upgrades.health : 0); // Ensure maxHealth is recalculated
	player.health = player.maxHealth;
	player.skin = storage.selectedSkin || "default";
	player.updateSkin();
	updateHealthBar();
	// Clear all bullets, enemies, coins
	for (var i = playerBullets.length - 1; i >= 0; i--) {
		playerBullets[i].destroy();
		playerBullets.splice(i, 1);
	}
	for (var i = enemyBullets.length - 1; i >= 0; i--) {
		enemyBullets[i].destroy();
		enemyBullets.splice(i, 1);
	}
	for (var i = enemies.length - 1; i >= 0; i--) {
		enemies[i].destroy();
		enemies.splice(i, 1);
	}
	for (var i = coinDrops.length - 1; i >= 0; i--) {
		coinDrops[i].destroy();
		coinDrops.splice(i, 1);
	}
	LK.setScore(0);
	scoreTxt.setText("0");
	coinTxtBL.setText(currency + '');
	coinTxt.setText(currency + '');
}
// --- Start/Market Button Events ---
startBtn.interactive = true;
startBtn.on('down', function (x, y, obj) {
	startGame();
});
// --- Start in start screen ---
showStartScreen();
// --- Utility Functions ---
function addCurrency(amount) {
	currency += amount;
	storage.currency = currency;
	coinTxt.setText(currency + '');
	if (typeof coinTxtBL !== "undefined") {
		coinTxtBL.setText(currency + '');
	}
	LK.getSound('coin').play();
}
function showScorePopup(x, y, value) {
	var popup = new Text2('+' + value, {
		size: 70,
		fill: "#fff"
	});
	popup.anchor.set(0.5, 0.5);
	popup.x = x;
	popup.y = y;
	game.addChild(popup);
	tween(popup, {
		y: y - 100,
		alpha: 0
	}, {
		duration: 900,
		easing: tween.easeOut,
		onFinish: function onFinish() {
			popup.destroy();
		}
	});
}
// --- Enemy Spawning ---
function spawnEnemy() {
	var r = Math.random();
	var enemy;
	// 15% chance to spawn a CoinEnemy (only these drop coins)
	if (r < 0.15) {
		enemy = new CoinEnemy();
	} else if (r < 0.5) {
		enemy = new EnemyRed();
	} else if (r < 0.8) {
		enemy = new EnemyBlue();
	} else {
		enemy = new EnemyGreen();
	}
	enemy.x = 180 + Math.random() * (2048 - 360);
	enemy.y = -enemy.height / 2;
	enemies.push(enemy);
	game.addChild(enemy);
}
// --- Game Move/Touch Controls ---
function handleMove(x, y, obj) {
	if (gameState !== "playing") return;
	// Always track last move position for smooth following
	game._lastMoveX = x;
	game._lastMoveY = y;
	// No dragNode logic needed; player always follows cursor/touch position
}
game.move = handleMove;
game.down = function (x, y, obj) {
	if (gameState !== "playing") return;
	handleMove(x, y, obj);
};
game.up = function (x, y, obj) {
	if (gameState !== "playing") return;
};
// --- Game Update Loop ---
game.update = function () {
	if (gameState !== "playing") return;
	// --- Player follows cursor/touch position smoothly ---
	if (game._lastMoveX !== undefined && game._lastMoveY !== undefined) {
		// Clamp to game area
		var minX = player.width / 2 + 40;
		var maxX = 2048 - player.width / 2 - 40;
		var minY = 200 + player.height / 2;
		var maxY = 2732 - player.height / 2 - 40;
		var targetX = game._lastMoveX;
		var targetY = game._lastMoveY;
		if (targetX < minX) targetX = minX;
		if (targetX > maxX) targetX = maxX;
		if (targetY < minY) targetY = minY;
		if (targetY > maxY) targetY = maxY;
		// Move smoothly toward target (lerp)
		var speed = player.baseSpeed + (storage.upgrades && storage.upgrades.speed ? storage.upgrades.speed : 0);
		// Slightly increase lerp responsiveness for snappier feel
		speed *= 1.08;
		var dx = targetX - player.x;
		var dy = targetY - player.y;
		var dist = Math.sqrt(dx * dx + dy * dy);
		if (dist > speed) {
			player.x += dx / dist * speed;
			player.y += dy / dist * speed;
		} else {
			player.x = targetX;
			player.y = targetY;
		}
	}
	// Player update
	player.update();
	// Player auto-shoot
	// 2 bullets per second at 60FPS: 60/2 = 30 ticks interval
	if (LK.ticks % 30 === 0) {
		player.shoot();
	}
	// Player bullets
	for (var i = playerBullets.length - 1; i >= 0; i--) {
		var b = playerBullets[i];
		b.update();
		// Track bullet creation time if not already set
		if (typeof b._createdAt === "undefined") {
			b._createdAt = LK.ticks;
		}
		// Remove if off screen
		if (b.y < -50 || typeof b._createdAt !== "undefined" && LK.ticks - b._createdAt >= 180) {
			b.destroy();
			playerBullets.splice(i, 1);
			continue;
		}
		// Check collision with enemies
		for (var j = enemies.length - 1; j >= 0; j--) {
			var e = enemies[j];
			if (b.intersects(e)) {
				var killed = e.takeDamage(1);
				b.destroy();
				playerBullets.splice(i, 1);
				if (killed) {
					e.destroy();
					enemies.splice(j, 1);
					// --- Health bonus for every 5 destroyed enemies ---
					enemiesDestroyedSinceLastHeal++;
					if (enemiesDestroyedSinceLastHeal >= 5) {
						enemiesDestroyedSinceLastHeal = 0;
						if (player && typeof player.heal === "function") {
							player.heal(1);
						}
					}
					// --- End health bonus ---
				}
				break;
			}
		}
	}
	// Enemy bullets
	for (var i = enemyBullets.length - 1; i >= 0; i--) {
		var b = enemyBullets[i];
		b.update();
		if (b.y > 2732 + 50) {
			b.destroy();
			enemyBullets.splice(i, 1);
			continue;
		}
		// Check collision with player
		if (b.intersects(player)) {
			player.takeDamage(1);
			b.destroy();
			enemyBullets.splice(i, 1);
			continue;
		}
	}
	// Coin drops: move, check pickup, remove if off screen
	for (var i = coinDrops.length - 1; i >= 0; i--) {
		var c = coinDrops[i];
		c.update();
		// Remove if off screen
		if (c.y > 2732 + 80) {
			c.destroy();
			coinDrops.splice(i, 1);
			continue;
		}
		// Check pickup by player (only on the frame it starts intersecting)
		if (!c.lastWasIntersecting && c.intersects(player)) {
			addCurrency(1);
			c.destroy();
			coinDrops.splice(i, 1);
			continue;
		}
		c.lastWasIntersecting = c.intersects(player);
	}
	// Enemy debris parts
	if (typeof enemyParts === "undefined") enemyParts = [];
	for (var i = enemyParts.length - 1; i >= 0; i--) {
		var part = enemyParts[i];
		if (part.parent) part.update();
		if (!part.parent) {
			enemyParts.splice(i, 1);
		}
	}
	// Enemies
	for (var i = enemies.length - 1; i >= 0; i--) {
		var e = enemies[i];
		e.update();
		// Remove if off screen
		if (e.y > 2732 + 100) {
			e.destroy();
			enemies.splice(i, 1);
			// Decrease score by 2 for each enemy that leaves the screen without being destroyed
			LK.setScore(LK.getScore() - 2);
			scoreTxt.setText(LK.getScore());
			// If score drops below zero, trigger game over
			if (LK.getScore() < 0) {
				LK.effects.flashScreen(0xff0000, 800);
				LK.showGameOver();
				return;
			}
			continue;
		}
		// Check collision with player
		if (e.intersects(player)) {
			player.takeDamage(2);
			LK.effects.flashObject(e, 0xff0000, 200);
			e.destroy();
			enemies.splice(i, 1);
			continue;
		}
	}
	// Enemy spawn logic: increase spawn rate over time
	if (spawnTimer <= 0) {
		spawnEnemy();
		spawnInterval = 90 - Math.floor(LK.getScore() / 10) * 4; // Increased base interval from 60 to 90 for slower spawns
		if (spawnInterval < 28) spawnInterval = 28; // Minimum interval increased from 18 to 28
		spawnTimer = spawnInterval;
	} else {
		spawnTimer--;
	}
	// Update score
	scoreTxt.setText(LK.getScore());
	// Win condition: none (endless), but could be added
};
// --- Music ---
LK.playMusic('bgmusic', {
	fade: {
		start: 0,
		end: 1,
		duration: 1200
	}
});
// --- Game Over Handler (currency gain) ---
LK.on('gameover', function () {
	// Add score to currency
	addCurrency(LK.getScore());
	// Save currency
	storage.currency = currency;
	coinTxt.setText(currency + '');
	coinTxtBL.setText(currency + '');
	coinTxtTL.setText(currency + '');
	// After a short delay, show start screen again
	LK.setTimeout(function () {
		showStartScreen();
	}, 1200);
	// Reset upgrades/skins for next run if needed (not implemented here)
});
// --- YouWin Handler (not used, but for future) ---
LK.on('youwin', function () {
	// Could reward bonus currency, etc.
});
// --- Prevent elements in top left 100x100
// (All GUI elements are placed away from top left, and player cannot move there)

===================================================================
--- original.js
+++ change.js
@@ -353,20 +353,20 @@
 
 /**** 
 * Game Code
 ****/ 
-// --- Global Variables ---
-// Player plane (default skin: gray)
-// Player bullet (yellow)
-// Enemy: Red Attacker
-// Enemy: Blue Speedster
-// Enemy: Green Tank
-// Enemy bullet (red)
-// Health bar background
-// Health bar foreground
-// Coin icon
-// Sounds
 // Music
+// Sounds
+// Coin icon
+// Health bar foreground
+// Health bar background
+// Enemy bullet (red)
+// Enemy: Green Tank
+// Enemy: Blue Speedster
+// Enemy: Red Attacker
+// Player bullet (yellow)
+// Player plane (default skin: gray)
+// --- Global Variables ---
 var player;
 var playerBullets = [];
 var enemies = [];
 var enemyBullets = [];
@@ -379,8 +379,10 @@
 var lastPlayerY = 0;
 var healthBarBg, healthBarFg;
 var scoreTxt, coinTxt, coinIcon;
 var currency = storage.currency || 0;
+// Track how many enemies have been destroyed for health bonus
+var enemiesDestroyedSinceLastHeal = 0;
 // --- GUI Elements ---
 // --- Start Screen State ---
 var gameState = "start"; // "start", "playing", "market"
 var startScreenContainer = new Container();
@@ -701,8 +703,17 @@
 				playerBullets.splice(i, 1);
 				if (killed) {
 					e.destroy();
 					enemies.splice(j, 1);
+					// --- Health bonus for every 5 destroyed enemies ---
+					enemiesDestroyedSinceLastHeal++;
+					if (enemiesDestroyedSinceLastHeal >= 5) {
+						enemiesDestroyedSinceLastHeal = 0;
+						if (player && typeof player.heal === "function") {
+							player.heal(1);
+						}
+					}
+					// --- End health bonus ---
 				}
 				break;
 			}
 		}