var Dot = Container.expand(function () {
	var self = Container.call(this);
	var dotGraphics = self.createAsset('dot', 'Dot Graphics', .5, .5);
	self.eaten = false;
});
var Snake = Container.expand(function () {
	var self = Container.call(this);
	var snakeGraphics = self.createAsset('snake', 'Snake Graphics', .5, .5);
	self.length = 1;
	self.direction = 'right';
	self.body = [];
	self.move = function () {
		var speed = 5;
		switch (self.direction) {
			case 'right':
				self.x += speed;
				break;
			case 'left':
				self.x -= speed;
				break;
			case 'down':
				self.y += speed;
				break;
			case 'up':
				self.y -= speed;
				break;
		}
	};
	self.eat = function (dot) {
		self.length++;
		var newSegment = self.createAsset('snakeBody', 'Snake Body Segment', .5, .5);
		self.body.push(newSegment);
		self.addChild(newSegment);
		if (self.body.length > 1) {
			var lastSegment = self.body[self.body.length - 2];
			newSegment.x = lastSegment.x;
			newSegment.y = lastSegment.y;
		}
	};
	self.checkCollision = function () {
		if (self.x < 0 || self.x > 2048 || self.y < 0 || self.y > 2732) {
			isGameOver = true;
		}
		for (var i = 0; i < self.body.length; i++) {
			if (self.intersects(self.body[i])) {
				isGameOver = true;
				break;
			}
		}
	};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	LK.stageContainer.setBackgroundColor(0x000000);
	var dots = [];
	var snake = self.addChild(new Snake());
	snake.x = 1024;
	snake.y = 1366;
	var scoreTxt = new Text2('0', {
		size: 150,
		fill: "#ffffff"
	});
	scoreTxt.anchor.set(.5, 0);
	LK.gui.topCenter.addChild(scoreTxt);
	var isGameOver = false;
	LK.on('tick', function () {
		snake.move();
		snake.checkCollision();
		if (isGameOver) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
		for (var i = 0; i < dots.length; i++) {
			if (snake.intersects(dots[i]) && !dots[i].eaten) {
				snake.eat(dots[i]);
				dots[i].eaten = true;
				scoreTxt.setText(parseInt(scoreTxt.text) + 1);
			}
		}
	});
	stage.on('down', function (obj) {
		var event = obj.event;
		var pos = event.getLocalPosition(self);
		var angle = Math.atan2(pos.y - snake.y, pos.x - snake.x);
		if (angle >= -Math.PI / 4 && angle < Math.PI / 4) {
			snake.direction = 'right';
		} else if (angle >= Math.PI / 4 && angle < 3 * Math.PI / 4) {
			snake.direction = 'down';
		} else if (angle >= 3 * Math.PI / 4 && angle <= Math.PI || angle >= -Math.PI && angle < -3 * Math.PI / 4) {
			snake.direction = 'left';
		} else if (angle >= -3 * Math.PI / 4 && angle < -Math.PI / 4) {
			snake.direction = 'up';
		}
	});
	var dotSpawnInterval = LK.setInterval(function () {
		var dot = new Dot();
		dot.x = Math.random() * 2048;
		dot.y = Math.random() * 2732;
		dots.push(dot);
		self.addChild(dot);
	}, 1000);
});

===================================================================
--- original.js
+++ change.js
@@ -8,11 +8,47 @@
 	var snakeGraphics = self.createAsset('snake', 'Snake Graphics', .5, .5);
 	self.length = 1;
 	self.direction = 'right';
 	self.body = [];
-	self.move = function () {};
-	self.eat = function (dot) {};
-	self.checkCollision = function () {};
+	self.move = function () {
+		var speed = 5;
+		switch (self.direction) {
+			case 'right':
+				self.x += speed;
+				break;
+			case 'left':
+				self.x -= speed;
+				break;
+			case 'down':
+				self.y += speed;
+				break;
+			case 'up':
+				self.y -= speed;
+				break;
+		}
+	};
+	self.eat = function (dot) {
+		self.length++;
+		var newSegment = self.createAsset('snakeBody', 'Snake Body Segment', .5, .5);
+		self.body.push(newSegment);
+		self.addChild(newSegment);
+		if (self.body.length > 1) {
+			var lastSegment = self.body[self.body.length - 2];
+			newSegment.x = lastSegment.x;
+			newSegment.y = lastSegment.y;
+		}
+	};
+	self.checkCollision = function () {
+		if (self.x < 0 || self.x > 2048 || self.y < 0 || self.y > 2732) {
+			isGameOver = true;
+		}
+		for (var i = 0; i < self.body.length; i++) {
+			if (self.intersects(self.body[i])) {
+				isGameOver = true;
+				break;
+			}
+		}
+	};
 });
 var Game = Container.expand(function () {
 	var self = Container.call(this);
 	LK.stageContainer.setBackgroundColor(0x000000);
@@ -44,15 +80,16 @@
 	});
 	stage.on('down', function (obj) {
 		var event = obj.event;
 		var pos = event.getLocalPosition(self);
-		if (pos.x > snake.x) {
+		var angle = Math.atan2(pos.y - snake.y, pos.x - snake.x);
+		if (angle >= -Math.PI / 4 && angle < Math.PI / 4) {
 			snake.direction = 'right';
-		} else if (pos.x < snake.x) {
-			snake.direction = 'left';
-		} else if (pos.y > snake.y) {
+		} else if (angle >= Math.PI / 4 && angle < 3 * Math.PI / 4) {
 			snake.direction = 'down';
-		} else if (pos.y < snake.y) {
+		} else if (angle >= 3 * Math.PI / 4 && angle <= Math.PI || angle >= -Math.PI && angle < -3 * Math.PI / 4) {
+			snake.direction = 'left';
+		} else if (angle >= -3 * Math.PI / 4 && angle < -Math.PI / 4) {
 			snake.direction = 'up';
 		}
 	});
 	var dotSpawnInterval = LK.setInterval(function () {