/**** 
* Classes
****/
// Define the Grendizer (player's character) class
var Grendizer = Container.expand(function () {
	var self = Container.call(this);
	var grendizerGraphics = self.createAsset('grendizer', 'Player character', 0.5, 0.5);
	self.speed = 50;
	self.moveTo = function (x) {
		self.x = Math.max(self.width / 2, Math.min(2048 - self.width / 2, x));
	};
	self.update = function () {
		// Update logic for Grendizer
	};
});
// Define the Bullet class for Grendizer
var HeroBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.createAsset('fireBall', 'Hero Fireball', 0.5, 0.5);
	self.speed = -10;
	self.move = function () {
		self.y += self.speed;
	};
});
// Define the 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;
	};
});
// Define the Boost class
var Boost = Container.expand(function () {
	var self = Container.call(this);
	var boostGraphics = self.createAsset('boost', 'Boost item', 0.5, 0.5);
	self.speed = 2;
	self.move = function () {
		self.y += self.speed;
	};
});

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

/**** 
* Game Code
****/
// Initialize important asset arrays
game.on('move', function (obj) {
	var touchPos = obj.event.getLocalPosition(game);
	player.moveTo(touchPos.x);
});
var heroBullets = [];
var enemies = [];
var boosts = [];
// Create the player's character
var player = game.addChild(new Grendizer());
player.x = 2048 / 2;
player.y = 2732 - player.height;
// Game tick event
LK.on('tick', function () {
	// Update player
	player.update();
	// Move and check hero bullets
	for (var i = heroBullets.length - 1; i >= 0; i--) {
		heroBullets[i].move();
		if (heroBullets[i].y < -heroBullets[i].height) {
			heroBullets[i].destroy();
			heroBullets.splice(i, 1);
		}
	}
	// Move and check enemies
	for (var j = enemies.length - 1; j >= 0; j--) {
		enemies[j].move();
		if (enemies[j].y > 2732 + enemies[j].height) {
			enemies[j].destroy();
			enemies.splice(j, 1);
		}
	}
	// Move and check boosts
	for (var k = boosts.length - 1; k >= 0; k--) {
		boosts[k].move();
		if (boosts[k].y > 2732 + boosts[k].height) {
			boosts[k].destroy();
			boosts.splice(k, 1);
		}
	}
	// Spawn enemies and boosts
	if (LK.ticks % 120 == 0) {
		var newEnemy = new Enemy();
		newEnemy.x = Math.random() * (2048 - newEnemy.width) + newEnemy.width / 2;
		newEnemy.y = -newEnemy.height;
		enemies.push(newEnemy);
		game.addChild(newEnemy);
	}
	if (LK.ticks % 300 == 0) {
		var newBoost = new Boost();
		newBoost.x = Math.random() * (2048 - newBoost.width) + newBoost.width / 2;
		newBoost.y = -newBoost.height;
		boosts.push(newBoost);
		game.addChild(newBoost);
	}
	// Check for collisions
	enemies.forEach(function (enemy) {
		if (player.intersects(enemy)) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
		heroBullets.forEach(function (bullet) {
			if (bullet.intersects(enemy)) {
				enemy.destroy();
				bullet.destroy();
				enemies.splice(enemies.indexOf(enemy), 1);
				heroBullets.splice(heroBullets.indexOf(bullet), 1);
			}
		});
	});
	boosts.forEach(function (boost) {
		if (player.intersects(boost)) {
			boost.destroy();
			boosts.splice(boosts.indexOf(boost), 1);
			// Implement boost effect here
		}
	});
});
// Touch event listeners for player movement
game.on('down', function (obj) {
	var touchPos = obj.event.getLocalPosition(game);
	player.moveTo(touchPos.x);
});
// Fire bullets
game.on('down', function (obj) {
	var newBullet = new HeroBullet();
	newBullet.x = player.x;
	newBullet.y = player.y - player.height / 2;
	heroBullets.push(newBullet);
	game.addChild(newBullet);
});

===================================================================
--- original.js
+++ change.js
@@ -5,14 +5,11 @@
 var Grendizer = Container.expand(function () {
 	var self = Container.call(this);
 	var grendizerGraphics = self.createAsset('grendizer', 'Player character', 0.5, 0.5);
 	self.speed = 50;
-	self.moveLeft = function () {
-		self.x = Math.max(self.width / 2, self.x - self.speed);
+	self.moveTo = function (x) {
+		self.x = Math.max(self.width / 2, Math.min(2048 - self.width / 2, x));
 	};
-	self.moveRight = function () {
-		self.x = Math.min(2048 - self.width / 2, self.x + self.speed);
-	};
 	self.update = function () {
 		// Update logic for Grendizer
 	};
 });
@@ -54,8 +51,12 @@
 /**** 
 * Game Code
 ****/
 // Initialize important asset arrays
+game.on('move', function (obj) {
+	var touchPos = obj.event.getLocalPosition(game);
+	player.moveTo(touchPos.x);
+});
 var heroBullets = [];
 var enemies = [];
 var boosts = [];
 // Create the player's character
@@ -130,13 +131,9 @@
 });
 // Touch event listeners for player movement
 game.on('down', function (obj) {
 	var touchPos = obj.event.getLocalPosition(game);
-	if (touchPos.x < player.x) {
-		player.moveLeft();
-	} else {
-		player.moveRight();
-	}
+	player.moveTo(touchPos.x);
 });
 // Fire bullets
 game.on('down', function (obj) {
 	var newBullet = new HeroBullet();