var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGraphics = self.createAsset('hero', 'Hero character', .5, .5);
	heroGraphics.scale.set(1.5);
	self.speed = 5;
	self.move = function (touchStart, touchEnd) {
		var dx = touchEnd.x - touchStart.x;
		var dy = touchEnd.y - touchStart.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		self.x += dx / distance * self.speed;
		self.y += dy / distance * self.speed;
	};
});
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.createAsset('enemy', 'Enemy character', .5, .5);
	enemyGraphics.scale.set(1.2);
	self.speed = 3;
	self.chase = function (hero) {
		var dx = hero.x - self.x;
		var dy = hero.y - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		self.x += dx / distance * self.speed;
		self.y += dy / distance * self.speed;
	};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var hero = self.addChild(new Hero());
	var enemies = [];
	var isGameOver = false;
	var lastSpeedIncrease = 0;
	var score = 0;
	var scoreTxt = new Text2('0', {
		size: 150,
		fill: '#ffffff'
	});
	scoreTxt.anchor.set(.5, 0);
	LK.gui.topCenter.addChild(scoreTxt);
	hero.x = 2048 / 2;
	hero.y = 2732 / 2;
	var spawnEnemy = function () {
		var enemy = self.addChild(new Enemy());
		enemy.x = Math.random() * 2048;
		enemy.y = Math.random() * 2732;
		enemies.push(enemy);
	};
	for (var i = 0; i < 5; i++) {
		spawnEnemy();
	}
	var enemySpawnInterval = LK.setInterval(spawnEnemy, 8000);
	var touchStart = {
		x: 0,
		y: 0
	};
	var touchEnd = {
		x: 0,
		y: 0
	};
	stage.on('down', function (obj) {
		touchStart = obj.event.getLocalPosition(self);
		hero.move(touchStart, touchStart);
	});
	stage.on('move', function (obj) {
		touchEnd = obj.event.getLocalPosition(self);
		hero.move(touchStart, touchEnd);
	});
	stage.on('up', function (obj) {
		touchStart = obj.event.getLocalPosition(self);
		hero.move(touchStart, touchStart);
	});
	LK.on('tick', function () {
		if (LK.ticks - lastSpeedIncrease >= 300) {
			for (var i = 0; i < enemies.length; i++) {
				enemies[i].speed += 1;
			}
			hero.speed += 1;
			lastSpeedIncrease = LK.ticks;
		}
		score += 1;
		scoreTxt.setText(score);
		for (var i = 0; i < enemies.length; i++) {
			enemies[i].chase(hero);
			if (enemies[i].intersects(hero)) {
				isGameOver = true;
				LK.effects.flashScreen(0xff0000, 1000);
				LK.showGameOver();
			}
		}
	});
});

===================================================================
--- original.js
+++ change.js
@@ -13,8 +13,9 @@
 });
 var Enemy = Container.expand(function () {
 	var self = Container.call(this);
 	var enemyGraphics = self.createAsset('enemy', 'Enemy character', .5, .5);
+	enemyGraphics.scale.set(1.2);
 	self.speed = 3;
 	self.chase = function (hero) {
 		var dx = hero.x - self.x;
 		var dy = hero.y - self.y;