/**** 
* Classes
****/ 
// Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -10;
	self.update = function () {
		self.y += self.speed;
		if (self.y < -bulletGraphics.height / 2) {
			self.destroy();
		}
	};
});
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.direction = 1; // 1 for right, -1 for left
	self.update = function () {
		self.x += self.speed * self.direction;
		if (self.x > 2048 - enemyGraphics.width / 2 || self.x < enemyGraphics.width / 2) {
			self.direction *= -1;
		}
	};
});
// EnemyBullet class
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('enemyBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10;
	self.update = function () {
		self.y += self.speed;
		if (self.y > 2732 + bulletGraphics.height / 2) {
			self.destroy();
		}
	};
});
//<Assets used in the game will automatically appear here>
// Spacecraft class for player
var Spacecraft = Container.expand(function () {
	var self = Container.call(this);
	var spacecraftGraphics = self.attachAsset('spacecraft', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10;
	self.moveLeft = function () {
		self.x -= self.speed;
		if (self.x < spacecraftGraphics.width / 2) {
			self.x = spacecraftGraphics.width / 2;
		}
	};
	self.moveRight = function () {
		self.x += self.speed;
		if (self.x > 2048 - spacecraftGraphics.width / 2) {
			self.x = 2048 - spacecraftGraphics.width / 2;
		}
	};
	self.shoot = function () {
		var bullet = new Bullet();
		bullet.x = self.x;
		bullet.y = self.y - spacecraftGraphics.height / 2;
		game.addChild(bullet);
		bullets.push(bullet);
	};
});

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

/**** 
* Game Code
****/ 
function showVictory() {
	// Flash screen green for 1 second (1000ms) to show victory.
	LK.effects.flashScreen(0x00ff00, 1000);
	// Display 'You Win' message
	var winText = new Text2('You Win', {
		size: 200,
		fill: "#ffffff"
	});
	winText.anchor.set(0.5, 0.5);
	winText.x = 2048 / 2;
	winText.y = 2732 / 2;
	LK.gui.center.addChild(winText);
	// Show game over. The game will be automatically paused while game over is showing.
	LK.showGameOver(); // Calling this will destroy the 'Game' and reset entire game state.
}
var scoreTxt = new Text2('0', {
	size: 150,
	fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var bullets = [];
var enemyBullets = [];
var player = new Spacecraft();
player.x = 2048 / 2;
player.y = 2732 - 150;
game.addChild(player);
var enemy = new Enemy();
enemy.x = 2048 / 2;
enemy.y = 100;
game.addChild(enemy);
// Handle keyboard events for player movement
LK.on('keydown', function (event) {
	switch (event.key) {
		case 'ArrowLeft':
			player.moveLeft();
			break;
		case 'ArrowRight':
			player.moveRight();
			break;
		case ' ':
			player.shoot();
			break;
	}
});
// Update game state
game.update = function () {
	enemy.update();
	// Enemy shooting logic
	if (LK.ticks % 60 === 0) {
		// Enemy shoots every second
		var enemyBullet = new EnemyBullet();
		enemyBullet.x = enemy.x;
		enemyBullet.y = enemy.y + enemy.height / 2;
		game.addChild(enemyBullet);
		enemyBullets.push(enemyBullet);
	}
	for (var i = bullets.length - 1; i >= 0; i--) {
		bullets[i].update();
		if (bullets[i].intersects(enemy)) {
			// Increase score
			LK.setScore(LK.getScore() + 1);
			// Update score text
			scoreTxt.setText(LK.getScore());
			// Add special effect on enemy hit
			LK.effects.flashObject(enemy, 0xffff00, 500); // Flash yellow for 500ms
			bullets[i].destroy();
			bullets.splice(i, 1);
		}
		if (bullets[i] && bullets[i].y < -50) {
			bullets[i].destroy();
			bullets.splice(i, 1);
		}
	}
	// Check for collision between enemy bullets and player
	for (var j = enemyBullets.length - 1; j >= 0; j--) {
		enemyBullets[j].update();
		if (enemyBullets[j].intersects(player)) {
			// Flash screen red for 1 second (1000ms) to show defeat.
			LK.effects.flashScreen(0xff0000, 1000);
			// Show game over. The game will be automatically paused while game over is showing.
			LK.showGameOver(); // Calling this will destroy the 'Game' and reset entire game state.
			return; // Exit the update loop
		}
		if (enemyBullets[j].y > 2732 + 50) {
			enemyBullets[j].destroy();
			enemyBullets.splice(j, 1);
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -118,9 +118,9 @@
 enemy.x = 2048 / 2;
 enemy.y = 100;
 game.addChild(enemy);
 // Handle keyboard events for player movement
-window.addEventListener('keydown', function (event) {
+LK.on('keydown', function (event) {
 	switch (event.key) {
 		case 'ArrowLeft':
 			player.moveLeft();
 			break;