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

/**** 
* Classes
****/ 
var Boss = Container.expand(function () {
	var self = Container.call(this);
	// Boss graphics
	var bossGraphics = self.attachAsset('boss', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Boss properties
	self.speed = 2;
	self.health = 50;
	self.points = 500;
	self.lastX = 0;
	self.moveDirection = 1;
	self.movePhase = 0;
	self.active = false;
	self.turrets = [];
	self.attackPhase = 0;
	self.attackTimer = 0;
	// Add turrets
	for (var i = 0; i < 4; i++) {
		var turret = self.addChild(LK.getAsset('bossPart', {
			anchorX: 0.5,
			anchorY: 0.5,
			x: i < 2 ? -100 : 100,
			y: i % 2 === 0 ? -50 : 50
		}));
		turret.health = 10;
		self.turrets.push(turret);
	}
	// Activate boss
	self.activate = function () {
		self.active = true;
		LK.getSound('bossAlert').play();
		// Entrance animation
		self.y = -150;
		tween.to(self, {
			y: 400
		}, 2000, tween.easing.easeOutQuad);
	};
	// Damage the boss
	self.damage = function (amount, target) {
		if (!self.active) {
			return false;
		}
		if (target) {
			// Hit a turret
			target.health -= amount;
			if (target.health <= 0) {
				// Create explosion
				var explosion = new Explosion();
				explosion.x = self.x + target.x;
				explosion.y = self.y + target.y;
				game.addChild(explosion);
				// Remove turret from array and destroy it
				var index = self.turrets.indexOf(target);
				if (index !== -1) {
					self.turrets.splice(index, 1);
				}
				target.destroy();
				// Add score
				LK.setScore(LK.getScore() + 50);
			} else {
				// Flash turret when hit
				LK.effects.flashObject(target, 0xffffff, 300);
			}
			return false;
		}
		// Hit the main boss body
		self.health -= amount;
		if (self.health <= 0) {
			// Create explosion
			var finalExplosion = new Explosion();
			finalExplosion.x = self.x;
			finalExplosion.y = self.y;
			game.addChild(finalExplosion);
			// Add score
			LK.setScore(LK.getScore() + self.points);
			// You win!
			LK.setTimeout(function () {
				LK.showYouWin();
			}, 1000);
			// Remove boss
			self.destroy();
			return true;
		}
		// Flash boss when hit
		LK.effects.flashObject(self, 0xffffff, 300);
		return false;
	};
	// Fire bullets from turrets
	self.fire = function () {
		if (!self.active || self.turrets.length === 0) {
			return;
		}
		// Fire from each turret
		for (var i = 0; i < self.turrets.length; i++) {
			var turret = self.turrets[i];
			var bullet = new EnemyBullet();
			bullet.x = self.x + turret.x;
			bullet.y = self.y + turret.y + 40;
			game.addChild(bullet);
			enemyBullets.push(bullet);
		}
		LK.getSound('enemyShoot').play();
	};
	// Update the boss
	self.update = function () {
		if (!self.active) {
			return;
		}
		self.lastX = self.x;
		// Move horizontally in a sine wave pattern
		self.movePhase += 0.02;
		self.x = 2048 / 2 + Math.sin(self.movePhase) * 500;
		// Attack patterns
		self.attackTimer++;
		if (self.attackTimer >= 60) {
			self.attackTimer = 0;
			// Different attack patterns based on phase
			if (self.attackPhase === 0) {
				self.fire();
			} else if (self.attackPhase === 1) {
				// Rapid fire
				self.fire();
				LK.setTimeout(function () {
					self.fire();
				}, 200);
				LK.setTimeout(function () {
					self.fire();
				}, 400);
			}
			// Change attack phase based on health
			self.attackPhase = self.health < 25 ? 1 : 0;
		}
	};
	return self;
});
// Set game background
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	// Enemy graphics
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Enemy properties
	self.speed = 3;
	self.fireRate = 120;
	self.health = 1;
	self.points = 10;
	self.lastY = 0;
	self.lastX = 0;
	self.moveDirection = 1;
	self.lastWasIntersecting = false;
	// Initialize with random horizontal movement
	self.horizontalSpeed = 1 + Math.random() * 2;
	if (Math.random() > 0.5) {
		self.horizontalSpeed *= -1;
	}
	// Damage the enemy
	self.damage = function (amount) {
		self.health -= amount;
		if (self.health <= 0) {
			// Create explosion
			var explosion = new Explosion();
			explosion.x = self.x;
			explosion.y = self.y;
			game.addChild(explosion);
			// Add score
			LK.setScore(LK.getScore() + self.points);
			// Remove enemy
			self.destroy();
			return true;
		}
		// Flash enemy when hit
		LK.effects.flashObject(self, 0xffffff, 300);
		return false;
	};
	// Fire a bullet
	self.fire = function () {
		if (Math.random() < 0.7 && player && player.health > 0) {
			var bullet = new EnemyBullet();
			bullet.x = self.x;
			bullet.y = self.y + 40;
			game.addChild(bullet);
			enemyBullets.push(bullet);
			LK.getSound('enemyShoot').play();
		}
	};
	// Update the enemy
	self.update = function () {
		self.lastX = self.x;
		self.lastY = self.y;
		// Move down
		self.y += self.speed;
		// Move side to side
		self.x += self.horizontalSpeed * self.moveDirection;
		// Bounce at edges
		if (self.x < 100 || self.x > 2048 - 100) {
			self.moveDirection *= -1;
		}
		// Occasionally fire
		if (LK.ticks % self.fireRate === 0) {
			self.fire();
		}
	};
	return self;
});
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	// Bullet graphics
	self.attachAsset('enemyBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Bullet properties
	self.speed = 8;
	self.lastY = 0;
	self.lastWasIntersecting = false;
	// Update the bullet position
	self.update = function () {
		self.lastY = self.y;
		self.y += self.speed;
	};
	return self;
});
var Explosion = Container.expand(function () {
	var self = Container.call(this);
	// Explosion graphics
	var graphic = self.attachAsset('explosion', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 0.8
	});
	// Play explosion sound
	LK.getSound('explosion').play();
	// Simple animation
	LK.setTimeout(function () {
		self.destroy();
	}, 500);
	return self;
});
var PlayerBullet = Container.expand(function () {
	var self = Container.call(this);
	// Bullet graphics
	self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Bullet properties
	self.speed = 15;
	self.damage = 1;
	self.lastY = 0;
	self.lastWasIntersecting = false;
	// Update the bullet position
	self.update = function () {
		self.lastY = self.y;
		self.y -= self.speed;
	};
	return self;
});
var PlayerShip = Container.expand(function () {
	var self = Container.call(this);
	// Ship graphics
	var shipGraphics = self.attachAsset('playerShip', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Ship properties
	self.speed = 15;
	self.health = 3;
	self.lastX = 0;
	self.lastY = 0;
	self.fireRate = 15;
	self.lastFired = 0;
	self.invulnerable = false;
	// Make ship fire a bullet
	self.fire = function () {
		if (LK.ticks - self.lastFired >= self.fireRate) {
			var bullet = new PlayerBullet();
			bullet.x = self.x;
			bullet.y = self.y - 50;
			game.addChild(bullet);
			bullets.push(bullet);
			LK.getSound('playerShoot').play();
			self.lastFired = LK.ticks;
		}
	};
	// Damage the ship
	self.damage = function () {
		if (self.invulnerable) {
			return;
		}
		self.health--;
		if (self.health <= 0) {
			// Game over
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
			return;
		}
		// Flash ship when hit
		LK.effects.flashObject(self, 0xff0000, 1000);
		// Make temporarily invulnerable
		self.invulnerable = true;
		shipGraphics.alpha = 0.5;
		LK.setTimeout(function () {
			self.invulnerable = false;
			shipGraphics.alpha = 1;
		}, 1500);
	};
	// Update method
	self.update = function () {
		self.lastX = self.x;
		self.lastY = self.y;
	};
	return self;
});
var PowerUp = Container.expand(function () {
	var self = Container.call(this);
	// PowerUp graphics
	var graphic = self.attachAsset('shield', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// PowerUp properties
	self.speed = 2;
	self.lastY = 0;
	self.lastWasIntersecting = false;
	// Apply the powerup effect
	self.apply = function () {
		LK.getSound('powerup').play();
	};
	// Update the powerup
	self.update = function () {
		self.lastY = self.y;
		self.y += self.speed;
	};
	return self;
});
var Sky = Container.expand(function () {
	var self = Container.call(this);
	// Create star particles
	self.stars = [];
	for (var i = 0; i < 100; i++) {
		var star = self.addChild(LK.getAsset('explosion', {
			anchorX: 0.5,
			anchorY: 0.5,
			x: Math.random() * 2048,
			y: Math.random() * 2732,
			alpha: 0.2 + Math.random() * 0.3,
			scaleX: 0.1 + Math.random() * 0.2,
			scaleY: 0.1 + Math.random() * 0.2,
			tint: 0xffffff
		}));
		// Randomize star speed
		star.speed = 1 + Math.random() * 3;
		self.stars.push(star);
	}
	// Update stars position
	self.update = function () {
		for (var i = 0; i < self.stars.length; i++) {
			var star = self.stars[i];
			star.y += star.speed;
			// Reset star position when it goes off screen
			if (star.y > 2732) {
				star.y = -50;
				star.x = Math.random() * 2048;
			}
		}
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// Set game background
game.setBackgroundColor(0x000033);
// Initialize sky background
var sky = new Sky();
game.addChild(sky);
// Initialize game variables
var player;
var bullets = [];
var enemies = [];
var enemyBullets = [];
var score = 0;
// Create score text
var scoreTxt = new Text2('Score: 0', {
	size: 60,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0, 0);
LK.gui.topLeft.addChild(scoreTxt);
scoreTxt.x = 120; // Keep away from top left 100x100 area
// Initialize player
player = new PlayerShip();
player.x = 2048 / 2;
player.y = 2732 - 200;
game.addChild(player);
// Create a new wave of enemies
function createWave() {
	// Create a new wave of enemies
	var count = 10;
	for (var i = 0; i < count; i++) {
		var enemy = new Enemy();
		enemy.x = 200 + Math.random() * (2048 - 400);
		enemy.y = -100 - Math.random() * 500;
		enemy.health = 1;
		enemy.points = 10;
		game.addChild(enemy);
		enemies.push(enemy);
	}
}
// Initial wave
createWave();
// Event handlers for player controls
var touchActive = false;
var touchX = 0;
// Mouse/touch down
game.down = function (x, y, obj) {
	touchActive = true;
	touchX = x;
	// Fire weapon
	if (player && player.health > 0) {
		player.fire();
	}
};
// Mouse/touch move
game.move = function (x, y, obj) {
	if (touchActive && player && player.health > 0) {
		// Move player
		var deltaX = x - touchX;
		player.x += deltaX;
		// Keep player within screen bounds
		player.x = Math.max(100, Math.min(2048 - 100, player.x));
		touchX = x;
	}
};
// Mouse/touch up
game.up = function (x, y, obj) {
	touchActive = false;
};
// Main game update loop
game.update = function () {
	// Update sky background
	sky.update();
	// Update player
	if (player) {
		player.update();
		// Auto-fire if touch is active
		if (touchActive && LK.ticks % 15 === 0) {
			player.fire();
		}
	}
	// Update player bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		var bullet = bullets[i];
		bullet.update();
		// Check if bullet is off screen
		if (bullet.y < -50) {
			bullet.destroy();
			bullets.splice(i, 1);
			continue;
		}
		// Check collision with enemies
		for (var j = enemies.length - 1; j >= 0; j--) {
			var enemy = enemies[j];
			if (!bullet.lastWasIntersecting && bullet.intersects(enemy)) {
				bullet.lastWasIntersecting = true;
				// Damage enemy
				if (enemy.damage(bullet.damage)) {
					enemies.splice(j, 1);
					// Create new enemies when all are defeated
					if (enemies.length === 0) {
						createWave();
					}
				}
				// Remove bullet
				bullet.destroy();
				bullets.splice(i, 1);
				break;
			}
		}
	}
	// Update enemy bullets
	for (var i = enemyBullets.length - 1; i >= 0; i--) {
		var enemyBullet = enemyBullets[i];
		enemyBullet.update();
		// Check if bullet is off screen
		if (enemyBullet.y > 2732 + 50) {
			enemyBullet.destroy();
			enemyBullets.splice(i, 1);
			continue;
		}
		// Check collision with player
		if (player && player.health > 0 && !enemyBullet.lastWasIntersecting && enemyBullet.intersects(player)) {
			enemyBullet.lastWasIntersecting = true;
			// Damage player
			player.damage();
			// Remove bullet
			enemyBullet.destroy();
			enemyBullets.splice(i, 1);
		}
	}
	// Update enemies
	for (var i = enemies.length - 1; i >= 0; i--) {
		var enemy = enemies[i];
		enemy.update();
		// Check if enemy is off screen
		if (enemy.y > 2732 + 100) {
			enemy.destroy();
			enemies.splice(i, 1);
			// Create new enemies when all are gone
			if (enemies.length === 0) {
				createWave();
			}
			continue;
		}
		// Check collision with player
		if (player && player.health > 0 && !enemy.lastWasIntersecting && enemy.intersects(player)) {
			enemy.lastWasIntersecting = true;
			// Damage player
			player.damage();
			// Damage enemy
			if (enemy.damage(1)) {
				enemies.splice(i, 1);
				// Create new enemies when all are gone
				if (enemies.length === 0) {
					createWave();
				}
			}
		}
	}
	// Update score text
	scoreTxt.setText('Score: ' + LK.getScore());
};

===================================================================
--- original.js
+++ change.js
@@ -344,8 +344,41 @@
 		self.y += self.speed;
 	};
 	return self;
 });
+var Sky = Container.expand(function () {
+	var self = Container.call(this);
+	// Create star particles
+	self.stars = [];
+	for (var i = 0; i < 100; i++) {
+		var star = self.addChild(LK.getAsset('explosion', {
+			anchorX: 0.5,
+			anchorY: 0.5,
+			x: Math.random() * 2048,
+			y: Math.random() * 2732,
+			alpha: 0.2 + Math.random() * 0.3,
+			scaleX: 0.1 + Math.random() * 0.2,
+			scaleY: 0.1 + Math.random() * 0.2,
+			tint: 0xffffff
+		}));
+		// Randomize star speed
+		star.speed = 1 + Math.random() * 3;
+		self.stars.push(star);
+	}
+	// Update stars position
+	self.update = function () {
+		for (var i = 0; i < self.stars.length; i++) {
+			var star = self.stars[i];
+			star.y += star.speed;
+			// Reset star position when it goes off screen
+			if (star.y > 2732) {
+				star.y = -50;
+				star.x = Math.random() * 2048;
+			}
+		}
+	};
+	return self;
+});
 
 /**** 
 * Initialize Game
 ****/ 
@@ -357,8 +390,11 @@
 * Game Code
 ****/ 
 // Set game background
 game.setBackgroundColor(0x000033);
+// Initialize sky background
+var sky = new Sky();
+game.addChild(sky);
 // Initialize game variables
 var player;
 var bullets = [];
 var enemies = [];
@@ -421,8 +457,10 @@
 	touchActive = false;
 };
 // Main game update loop
 game.update = function () {
+	// Update sky background
+	sky.update();
 	// Update player
 	if (player) {
 		player.update();
 		// Auto-fire if touch is active