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

/**** 
* Classes
****/ 
// Class for enemy ships with wave-based spawning and better animation
var EnemyShip = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemyShip', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Spawn animation: Fade in & Scale up
	enemyGraphics.scale.set(0);
	enemyGraphics.alpha = 0;
	tween(enemyGraphics.scale, {
		x: 1,
		y: 1
	}, {
		duration: 500
	});
	tween(enemyGraphics, {
		alpha: 1
	}, {
		duration: 500
	});
	self.speed = 3 + Math.random() * 2; // Slight variation in speed
	self.driftAmount = 3; // Side drift range
	self.driftSpeed = 50 + Math.random() * 20; // Slight variation in drift speed
	self.update = function () {
		self.y += self.speed;
		self.x += Math.sin(LK.ticks / self.driftSpeed) * self.driftAmount;
		// Destroy if off-screen with fade-out effect
		if (self.y > 2732 + enemyGraphics.height / 2) {
			tween(enemyGraphics, {
				alpha: 0
			}, {
				duration: 500,
				onFinish: function onFinish() {
					self.destroy();
					enemyShips.splice(enemyShips.indexOf(self), 1);
				}
			});
		}
	};
});
// Class for player bullets with proper destruction
var PlayerBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -15;
	self.update = function () {
		self.y += self.speed;
		if (self.y < -bulletGraphics.height) {
			self.destroy();
			playerBullets.splice(playerBullets.indexOf(self), 1);
		}
	};
});
// Class for the player's ship with shooting cooldown
var PlayerShip = Container.expand(function () {
	var self = Container.call(this);
	var shipGraphics = self.attachAsset('playerShip', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10;
	self.canShoot = true; // Prevents spam shooting
	self.shootCooldown = 300; // 300ms cooldown
	self.shoot = function () {
		if (self.canShoot) {
			var bullet = new PlayerBullet();
			bullet.x = self.x;
			bullet.y = self.y - shipGraphics.height / 2;
			game.addChild(bullet);
			playerBullets.push(bullet);
			self.canShoot = false;
			LK.setTimeout(function () {
				self.canShoot = true;
			}, self.shootCooldown);
		}
	};
	self.update = function () {
		for (var i = 0; i < enemyShips.length; i++) {
			if (self.intersects(enemyShips[i])) {
				LK.showGameOver();
			}
		}
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
/**** 
* Game Logic
****/ 
var playerBullets = [];
var enemyShips = [];
var player = game.addChild(new PlayerShip());
player.x = 2048 / 2;
player.y = 2732 - 200;
// Score Display
var scoreText = new Text2('0', {
	size: 150,
	fill: 0xFFFFFF
});
scoreText.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreText);
// Wave Variables
var waveNumber = 1;
var enemiesPerWave = 5;
var enemiesSpawned = 0;
// Function to spawn enemies in waves
function spawnEnemy() {
	if (enemiesSpawned < enemiesPerWave) {
		var enemy = new EnemyShip();
		enemy.x = Math.random() * 2048;
		enemy.y = -100;
		game.addChild(enemy);
		enemyShips.push(enemy);
		enemiesSpawned++;
	} else if (enemyShips.length === 0) {
		// Start next wave when all enemies are destroyed
		setTimeout(function () {
			waveNumber++;
			enemiesPerWave += 2; // Increase difficulty each wave
			enemiesSpawned = 0;
		}, 1000);
	}
}
// Game update loop
game.update = function () {
	// Update player bullets
	for (var i = playerBullets.length - 1; i >= 0; i--) {
		playerBullets[i].update();
	}
	// Update enemy ships
	for (var j = enemyShips.length - 1; j >= 0; j--) {
		enemyShips[j].update();
	}
	// Check for collisions between player bullets and enemy ships
	for (var k = playerBullets.length - 1; k >= 0; k--) {
		for (var l = enemyShips.length - 1; l >= 0; l--) {
			if (playerBullets[k] && enemyShips[l] && playerBullets[k].intersects(enemyShips[l])) {
				tween(enemyShips[l], {
					alpha: 0
				}, {
					duration: 300,
					onFinish: function onFinish() {
						enemyShips[l].destroy();
						enemyShips.splice(l, 1);
					}
				});
				playerBullets[k].destroy();
				playerBullets.splice(k, 1);
				// Update score
				LK.setScore(LK.getScore() + 1);
				scoreText.setText(LK.getScore());
				break;
			}
		}
	}
	// Spawn enemies periodically
	if (LK.ticks % 60 === 0) {
		spawnEnemy();
	}
};
// Handle player movement
game.move = function (x, y, obj) {
	player.x = x;
};
// Handle shooting
game.down = function (x, y, obj) {
	player.shoot();
};

===================================================================
--- original.js
+++ change.js
@@ -80,9 +80,9 @@
 			bullet.y = self.y - shipGraphics.height / 2;
 			game.addChild(bullet);
 			playerBullets.push(bullet);
 			self.canShoot = false;
-			setTimeout(function () {
+			LK.setTimeout(function () {
 				self.canShoot = true;
 			}, self.shootCooldown);
 		}
 	};