/**** 
* Classes
****/ 
// Define a class for bullets
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -15;
	self.update = function () {
		self.y += self.speed;
		if (self.y < 0) {
			self.destroy();
		}
	};
});
// Define a class for enemies
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.update = function () {
		self.y += self.speed;
		if (self.y > 2732) {
			self.y = 0;
			self.x = Math.random() * 2048;
		}
	};
});
// Define a class for the entity
var Entity = Container.expand(function () {
	var self = Container.call(this);
	var entityGraphics = self.attachAsset('entity', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		self.down = function (x, y, obj) {
			this.timer = LK.setTimeout(function () {
				this.destroy();
			}.bind(this), 5000);
		};
		self.up = function (x, y, obj) {
			LK.clearTimeout(this.timer);
		};
		if (this.intersects(game.mouse)) {
			this.border = 5;
			this.borderColor = 0xFFFFFF;
		} else {
			this.border = 0;
		}
	};
});
// Define a class for the ground
var Ground = Container.expand(function () {
	var self = Container.call(this);
	var groundGraphics = self.attachAsset('ground', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		// Ground update logic
	};
});
//<Assets used in the game will automatically appear here>
//<Write imports for supported plugins here>
// Define a class for the MainCharacter
var MainCharacter = Container.expand(function () {
	var self = Container.call(this);
	var mainCharacterGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10;
	self.update = function () {
		// MainCharacter update logic
		if (game.mouse.down) {
			var dx = game.mouse.x - self.x;
			var dy = game.mouse.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance > self.speed) {
				self.x += dx / distance * self.speed;
				self.y += dy / distance * self.speed;
			} else {
				self.x = game.mouse.x;
				self.y = game.mouse.y;
			}
		}
	};
});
// Define a class for the purple square
var PurpleSquare = Container.expand(function () {
	var self = Container.call(this);
	var squareGraphics = self.attachAsset('entity', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		self.down = function (x, y, obj) {
			this.destroy();
		};
	};
});

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

/**** 
* Game Code
****/ 
// Initialize ground
var ground = [];
for (var i = 0; i < 20; i++) {
	for (var j = 0; j < 10; j++) {
		var groundPiece = new Ground();
		groundPiece.x = i * 100;
		groundPiece.y = 2732 - j * 100;
		ground.push(groundPiece);
		game.addChild(groundPiece);
	}
}
// Initialize main character
var mainCharacter = game.addChild(new MainCharacter());
mainCharacter.x = 2048 / 2;
mainCharacter.y = 2732 - 150;
// Initialize purple squares
var purpleSquares = [];
for (var i = 0; i < 20; i++) {
	for (var j = 0; j < 10; j++) {
		var purpleSquare = new PurpleSquare();
		purpleSquare.x = i * 100;
		purpleSquare.y = 2732 - j * 100;
		purpleSquares.push(purpleSquare);
		game.addChild(purpleSquare);
	}
}
// Initialize bullets
var bullets = [];
// Initialize enemies
var enemies = [];
// Handle player movement
game.down = function (x, y, obj) {
	mainCharacter.x = x;
	mainCharacter.y = y;
};
// Handle shooting
game.up = function (x, y, obj) {
	var bullet = new Bullet();
	bullet.x = mainCharacter.x;
	bullet.y = mainCharacter.y;
	bullets.push(bullet);
	game.addChild(bullet);
};
// Game update loop
game.update = function () {
	// Update main character
	mainCharacter.update();
	// Update enemies
	for (var i = 0; i < enemies.length; i++) {
		enemies[i].update();
		if (mainCharacter.intersects(enemies[i])) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	}
	// Update bullets
	for (var j = bullets.length - 1; j >= 0; j--) {
		bullets[j].update();
		for (var k = enemies.length - 1; k >= 0; k--) {
			if (bullets[j].intersects(enemies[k])) {
				bullets[j].destroy();
				bullets.splice(j, 1);
				enemies[k].destroy();
				enemies.splice(k, 1);
				break;
			}
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -78,9 +78,9 @@
 	});
 	self.speed = 10;
 	self.update = function () {
 		// MainCharacter update logic
-		if (game.mouse.isDown) {
+		if (game.mouse.down) {
 			var dx = game.mouse.x - self.x;
 			var dy = game.mouse.y - self.y;
 			var distance = Math.sqrt(dx * dx + dy * dy);
 			if (distance > self.speed) {