var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGraphics = self.createAsset('hero', 'Hero character', .5, .5);
	heroGraphics.scale.set(6);
	self.speed = 5;
	self.move = function () {};
	self.punch = function () {};
});
var Punch = Container.expand(function () {
	var self = Container.call(this);
	self.velocity = {
		x: 0,
		y: 0
	};
	self.setVelocity = function (targetX, targetY) {
		var dx = targetX - self.x;
		var dy = targetY - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		self.velocity.x = self.speed * (dx / distance);
		self.velocity.y = self.speed * (dy / distance);
	};
	self.move = function () {
		self.x += self.velocity.x;
		self.y += self.velocity.y;
	};
	var punchGraphics = self.createAsset('punch', 'Punch Graphics', .5, .5);
	punchGraphics.scale.set(2);
	punchGraphics.rotation = Math.PI / 2;
	self.speed = 15;
	var angle = Math.atan2(dy, dx);
	punchGraphics.rotation = angle;
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	LK.stageContainer.setBackgroundColor(0x000000);
	var hero = self.addChild(new Hero());
	var enemies = [];
	var punches = [];
	var scoreTxt = new Text2('0', {
		size: 150,
		fill: "#ffffff"
	});
	LK.gui.topCenter.addChild(scoreTxt);
	var isGameOver = false;
	var tickOffset = 0;
	hero.x = hero.width / 2;
	hero.y = 2732 / 2;
	var punchCooldown = 500;
	var lastPunchTime = 0;
	LK.stage.on('down', function (obj) {
		var currentTime = Date.now();
		if (currentTime - lastPunchTime >= punchCooldown) {
			var event = obj.event;
			var tapPosition = event.getLocalPosition(self);
			var punch = new Punch();
			punch.x = hero.x;
			punch.y = hero.y;
			punch.setVelocity(tapPosition.x, tapPosition.y);
			punches.push(punch);
			self.addChild(punch);
			LK.effects.flashObject(hero, 0xffcc00, 100);
			lastPunchTime = currentTime;
		}
	});
	LK.on('tick', function () {
		hero.move();
		for (var i = punches.length - 1; i >= 0; i--) {
			var punch = punches[i];
			punch.move();
		}
		if (isGameOver) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	});
});

===================================================================
--- original.js
+++ change.js