/**** 
* Classes
****/
// Hero class
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGraphics = self.createAsset('hero', 'Hero character', 0.5, 0.5);
	self.speed = 5;
	self.bulletCooldown = 0;
	self.moveLeft = function () {
		self.x = Math.max(self.width / 2, self.x - self.speed);
	};
	self.moveRight = function () {
		self.x = Math.min(2048 - self.width / 2, self.x + self.speed);
	};
	self.shoot = function () {
		if (self.bulletCooldown <= 0) {
			var bullet = new HeroBullet();
			bullet.x = self.x;
			bullet.y = self.y - self.height / 2;
			game.addChild(bullet);
			bullets.push(bullet);
			self.bulletCooldown = 20; // Cooldown period before next shot
		}
	};
	self.update = function () {
		if (self.bulletCooldown > 0) {
			self.bulletCooldown--;
		}
		var joystickDirection = joystick.getDirection();
		if (joystickDirection.x < -10) {
			self.moveLeft();
		} else if (joystickDirection.x > 10) {
			self.moveRight();
		}
	};
});
// HeroBullet class
var HeroBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.createAsset('heroBullet', 'Hero bullet', 0.5, 1);
	self.speed = -10;
	self.move = function () {
		self.y += self.speed;
	};
});
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.createAsset('enemy', 'Enemy character', 0.5, 0.5);
	self.speed = 2;
	self.move = function () {
		self.y += self.speed;
	};
});
// EnemyBullet class
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.createAsset('enemyBullet', 'Enemy bullet', 0.5, 0);
	self.speed = 5;
	self.move = function () {
		self.y += self.speed;
	};
});
// Joystick class
var Joystick = Container.expand(function () {
	var self = Container.call(this);
	var joystickGraphics = self.createAsset('joystickBase', 'Joystick base', 0.5, 0.5);
	var joystickKnob = self.createAsset('joystickKnob', 'Joystick knob', 0.5, 0.5);
	self.addChild(joystickKnob);
	self.isDragging = false;
	self.startPos = {
		x: 0,
		y: 0
	};
	self.currentPos = {
		x: 0,
		y: 0
	};
	self.delta = {
		x: 0,
		y: 0
	};
	self.on('down', function (obj) {
		self.isDragging = true;
		self.startPos = obj.event.getLocalPosition(self);
	});
	self.on('move', function (obj) {
		if (self.isDragging) {
			self.currentPos = obj.event.getLocalPosition(self);
			self.delta.x = self.currentPos.x - self.startPos.x;
			self.delta.y = self.currentPos.y - self.startPos.y;
			joystickKnob.x = Math.max(-50, Math.min(50, self.delta.x));
			joystickKnob.y = Math.max(-50, Math.min(50, self.delta.y));
		}
	});
	self.on('up', function (obj) {
		self.isDragging = false;
		joystickKnob.x = 0;
		joystickKnob.y = 0;
		self.delta.x = 0;
		self.delta.y = 0;
	});
	self.getDirection = function () {
		return self.delta;
	};
});
// ShootButton class
var ShootButton = Container.expand(function () {
	var self = Container.call(this);
	var buttonGraphics = self.createAsset('shootButton', 'Shoot button', 0.5, 0.5);
	self.on('down', function () {
		hero.shoot();
	});
});

/**** 
* Initialize Game
****/
var game = new LK.Game({
	backgroundColor: 0x000000,
	// Init game with black background
	backgroundImage: 'earthBackground' // Set background image to Earth
});

/**** 
* Game Code
****/
var shootButton = game.addChild(new ShootButton());
shootButton.x = 2048 - 150; // Position from right
shootButton.y = 2732 - 150; // Position from bottom
var joystick = game.addChild(new Joystick());
joystick.x = 150; // Position from left
joystick.y = 2732 - 150; // Position from bottom
// Initialize important asset arrays
var bullets = [];
var enemies = [];
var enemyBullets = [];
var score = 0;
var hero = game.addChild(new Hero());
hero.x = 1024; // Center of the screen
hero.y = 2732 - 200; // Near the bottom of the screen
// Score display
var scoreTxt = new Text2('0', {
	size: 150,
	fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Game tick event
LK.on('tick', function () {
	// Update hero
	hero.update();
	// Move and check bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		bullets[i].move();
		if (bullets[i].y < -bullets[i].height) {
			bullets[i].destroy();
			bullets.splice(i, 1);
		} else {
			// Check for bullet collision with enemies
			for (var j = enemies.length - 1; j >= 0; j--) {
				if (bullets[i].intersects(enemies[j])) {
					enemies[j].destroy();
					enemies.splice(j, 1);
					bullets[i].destroy();
					bullets.splice(i, 1);
					score += 10;
					scoreTxt.setText(score.toString());
					break;
				}
			}
		}
	}
	// Move and check enemy bullets
	for (var k = enemyBullets.length - 1; k >= 0; k--) {
		enemyBullets[k].move();
		if (enemyBullets[k].y > 2732 + enemyBullets[k].height) {
			enemyBullets[k].destroy();
			enemyBullets.splice(k, 1);
		} else if (enemyBullets[k].intersects(hero)) {
			// Game over condition
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	}
	// Move enemies and potentially shoot
	for (var l = enemies.length - 1; l >= 0; l--) {
		enemies[l].move();
		if (Math.random() < 0.01) {
			// Random chance to shoot
			var enemyBullet = new EnemyBullet();
			enemyBullet.x = enemies[l].x;
			enemyBullet.y = enemies[l].y + enemies[l].height / 2;
			game.addChild(enemyBullet);
			enemyBullets.push(enemyBullet);
		}
	}
	// Spawn enemies
	if (LK.ticks % 120 == 0) {
		// Every 2 seconds
		var newEnemy = new Enemy();
		newEnemy.x = Math.random() * (2048 - newEnemy.width) + newEnemy.width / 2;
		newEnemy.y = -newEnemy.height / 2;
		enemies.push(newEnemy);
		game.addChild(newEnemy);
	}
});

===================================================================
--- original.js
+++ change.js
@@ -117,9 +117,11 @@
 /**** 
 * Initialize Game
 ****/
 var game = new LK.Game({
-	backgroundColor: 0x000000 // Init game with black background
+	backgroundColor: 0x000000,
+	// Init game with black background
+	backgroundImage: 'earthBackground' // Set background image to Earth
 });
 
 /**** 
 * Game Code