var Dot = Container.expand(function () {
	var self = Container.call(this);
	var dotGraphics = self.createAsset('dot', 'Dot Graphics', .5, .5);
	self.speed = 0.02;
	self.circleSize = 600;
	self.rotate = function (centerX, centerY) {
		var angle = Math.atan2(self.y - centerY, self.x - centerX) + self.speed;
		self.x = centerX + Math.cos(angle) * self.circleSize;
		self.y = centerY + Math.sin(angle) * self.circleSize;
	};
});
var Target = Container.expand(function () {
	var self = Container.call(this);
	var targetGraphics = self.createAsset('target', 'Target Graphics', .5, .5);
	self.speed = -0.01;
	self.maxSpeed = 0.02;
	self.circleSize = 600;
	self.rotate = function (centerX, centerY) {
		var angle = Math.atan2(self.y - centerY, self.x - centerX) + self.speed;
		self.x = centerX + Math.cos(angle) * self.circleSize;
		self.y = centerY + Math.sin(angle) * self.circleSize;
	};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var centerX = 2048 / 2;
	var centerY = 2732 / 2;
	LK.stageContainer.setBackgroundColor(0xd9e1e4);
	var background = self.createAsset('background', 'Background Graphics', .5, .5);
	background.x = centerX - 60;
	background.y = centerY + 20;
	var target = self.addChild(new Target());
	target.x = centerX - target.circleSize;
	target.y = centerY;
	var dot = self.addChild(new Dot());
	dot.x = centerX + dot.circleSize;
	dot.y = centerY;
	target.x = centerX - target.circleSize;
	target.y = centerY;
	var scoreTxt = new Text2('0', {
		size: 150,
		fill: "#ffffff"
	});
	scoreTxt.anchor.set(.5, 0);
	LK.gui.topCenter.addChild(scoreTxt);
	var score = 0;
	LK.on('tick', function () {
		dot.rotate(centerX, centerY);
		target.rotate(centerX, centerY);
	});
	stage.on('down', function () {
		if (dot.intersects(target)) {
			score++;
			scoreTxt.setText(score.toString());
			dot.speed *= -1;
			target.maxSpeed += 0.002;
			target.speed = (Math.random() * target.maxSpeed + 0.01) * (target.speed > 0 ? -1 : 1);
		} else {
			LK.showGameOver();
		}
	});
});

===================================================================
--- original.js
+++ change.js
@@ -1,9 +1,9 @@
 var Dot = Container.expand(function () {
 	var self = Container.call(this);
 	var dotGraphics = self.createAsset('dot', 'Dot Graphics', .5, .5);
 	self.speed = 0.02;
-	self.circleSize = 700;
+	self.circleSize = 600;
 	self.rotate = function (centerX, centerY) {
 		var angle = Math.atan2(self.y - centerY, self.x - centerX) + self.speed;
 		self.x = centerX + Math.cos(angle) * self.circleSize;
 		self.y = centerY + Math.sin(angle) * self.circleSize;
@@ -13,9 +13,9 @@
 	var self = Container.call(this);
 	var targetGraphics = self.createAsset('target', 'Target Graphics', .5, .5);
 	self.speed = -0.01;
 	self.maxSpeed = 0.02;
-	self.circleSize = 700;
+	self.circleSize = 600;
 	self.rotate = function (centerX, centerY) {
 		var angle = Math.atan2(self.y - centerY, self.x - centerX) + self.speed;
 		self.x = centerX + Math.cos(angle) * self.circleSize;
 		self.y = centerY + Math.sin(angle) * self.circleSize;