var Blob = Container.expand(function () {
	var self = Container.call(this);
	var blobGraphics = self.createAsset('blob', 'Blob Graphics', 0.5, 0.5);
	self.speed = 5;
	self.vx = 0;
	self.vy = 0;
	self.move = function () {
		self.x = Math.max(0, Math.min(self.x + self.vx, 16384));
		self.y = Math.max(0, Math.min(self.y + self.vy, 16384));
	};
	self.expand = function () {};
});
var Foe = Container.expand(function () {
	var self = Container.call(this);
	var foeGraphics = self.createAsset('foe', 'Foe Graphics', 0.5, 0.5);
	self.speed = 3;
	self.move = function () {};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	self.worldWidth = 16384;
	self.worldHeight = 16384;
	var background = self.createAsset('background', 'Background', 0, 0);
	background.width = self.worldWidth;
	background.height = self.worldHeight;
	self.addChildAt(background, 0);
	var blobs = [];
	var foes = [];
	var isGameOver = false;
	var dragNode = null;
	var playerBlob = self.addChild(new Blob());
	playerBlob.x = self.worldWidth / 2;
	playerBlob.y = self.worldHeight / 2;
	playerBlob.width = 300;
	playerBlob.height = 300;
	blobs.push(playerBlob);
	for (var i = 0; i < 100; i++) {
		var foe = self.addChild(new Foe());
		foe.x = Math.random() * self.worldWidth;
		foe.y = Math.random() * self.worldHeight;
		foes.push(foe);
	}
	var joystickBase = LK.gui.bottomRight.createAsset('joystickBase', 'Joystick Base', 1, 1);
	var joystickStick = joystickBase.createAsset('joystickStick', 'Joystick Stick', 0.5, 0.5);
	joystickBase.visible = true;
	joystickStick.visible = false;
	var score = 0;
	var scoreTxt = new Text2(score.toString(), {
		size: 150,
		fill: '#ffffff'
	});
	scoreTxt.anchor.set(.5, .5);
	LK.gui.center.addChild(scoreTxt);
	stage.on('down', function (obj) {
		var event = obj.event;
		var pos = event.getLocalPosition(joystickBase.parent);
		joystickBase.visible = true;
		joystickDrag = true;
	});
	stage.on('up', function (obj) {
		joystickBase.visible = false;
	});
	var joystickDrag = false;
	joystickBase.on('down', function (obj) {
		joystickDrag = true;
	});
	var initialJoystickPos = null;
	stage.on('down', function (obj) {
		var event = obj.event;
		initialJoystickPos = event.getLocalPosition(joystickBase.parent);
		joystickDrag = true;
	});
	stage.on('move', function (obj) {
		if (joystickDrag) {
			var event = obj.event;
			var pos = event.getLocalPosition(joystickBase.parent);
			var dx = pos.x - initialJoystickPos.x;
			var dy = pos.y - initialJoystickPos.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			var angle = Math.atan2(dy, dx);
			playerBlob.vx = Math.cos(angle) * playerBlob.speed;
			playerBlob.vy = Math.sin(angle) * playerBlob.speed;
			joystickStick.x = Math.min(distance, joystickBase.width / 2) * Math.cos(angle);
			joystickStick.y = Math.min(distance, joystickBase.height / 2) * Math.sin(angle);
			joystickStick.visible = true;
		}
	});
	stage.on('up', function (obj) {
		joystickDrag = false;
		playerBlob.vx = 0;
		playerBlob.vy = 0;
		joystickStick.visible = false;
		joystickStick.x = 0;
		joystickStick.y = 0;
	});
	LK.on('tick', function () {
		for (var i = 0; i < blobs.length; i++) {
			blobs[i].move();
		}
		for (var i = 0; i < foes.length; i++) {
			foes[i].move();
		}
		for (var i = 0; i < blobs.length; i++) {
			for (var j = 0; j < foes.length; j++) {
				if (blobs[i].intersects(foes[j])) {
					blobs[i].expand();
					foes[j].destroy();
					foes.splice(j, 1);
					score += 1;
					scoreTxt.setText(score.toString());
				}
			}
		}
		if (blobs.length == 0) {
			isGameOver = true;
		}
		if (isGameOver) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
		self.x = -Math.min(Math.max(playerBlob.x, 2048 / 2), self.worldWidth - 2048 / 2) + 2048 / 2;
		self.y = -Math.min(Math.max(playerBlob.y, 2732 / 2), self.worldHeight - 2732 / 2) + 2732 / 2;
	});
});

===================================================================
--- original.js
+++ change.js
@@ -57,9 +57,9 @@
 		joystickBase.visible = true;
 		joystickDrag = true;
 	});
 	stage.on('up', function (obj) {
-		joystick.visible = false;
+		joystickBase.visible = false;
 	});
 	var joystickDrag = false;
 	joystickBase.on('down', function (obj) {
 		joystickDrag = true;