var BluePotion = Container.expand(function () {
	var self = Container.call(this);
	var bluePotionGraphics = self.createAsset('bluePotion', 'Shield Potion', .5, .5);
	self.speed = 3;
	self.move = function () {
		self.y += self.speed;
	};
});
var OrangePotion = Container.expand(function () {
	var self = Container.call(this);
	var orangePotionGraphics = self.createAsset('orangePotion', 'Fireball Potion', .5, .5);
	self.speed = 3;
	self.move = function () {
		self.y += self.speed;
	};
});
var RedPotion = Container.expand(function () {
	var self = Container.call(this);
	var redPotionGraphics = self.createAsset('redPotion', 'Extra Heart Potion', .5, .5);
	self.speed = 3;
	self.move = function () {
		self.y += self.speed;
	};
});
var Heart = Container.expand(function () {
	var self = Container.call(this);
	var heartGraphics = self.createAsset('heart', 'Player Life', .5, .5);
});
var Rock = Container.expand(function () {
	var self = Container.call(this);
	var rockGraphics = self.createAsset('rock', 'Falling Rock', .5, .5);
	self.speed = 5;
	self.move = function () {
		self.y += self.speed;
	};
});
var Potion = Container.expand(function () {
	var self = Container.call(this);
	var potionGraphics = self.createAsset('potion', 'Boost Potion', .5, .5);
	self.speed = 3;
	self.move = function () {
		self.y += self.speed;
	};
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.createAsset('player', 'Player Character', .5, .5);
	self.shield = false;
	self.move = function (x, y) {
		self.x = x;
		self.y = y;
	};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var background = self.createAsset('background', 'Game Background', 0, 0);
	background.width = 2048;
	background.height = 2732;
	var rocks = [];
	var potions = [];
	var player = self.addChild(new Player());
	player.x = 2048 / 2;
	player.y = 2732 - player.height;
	var lives = 3;
	var hearts = [];
	for (var i = 0; i < lives; i++) {
		var heart = new Heart();
		heart.x = 50 + i * 100;
		heart.y = 50;
		hearts.push(heart);
		LK.gui.topLeft.addChild(heart);
	}
	var fireballIcon = self.createAsset('fireballIcon', 'Fireball Icon', .5, .5);
	fireballIcon.x = 50;
	fireballIcon.y = 150;
	LK.gui.topLeft.addChild(fireballIcon);
	var shieldIcon = self.createAsset('shieldIcon', 'Shield Icon', .5, .5);
	shieldIcon.x = 50;
	shieldIcon.y = 250;
	LK.gui.topLeft.addChild(shieldIcon);
	var scoreTxt = new Text2('0', {
		size: 150,
		fill: "#ffffff"
	});
	scoreTxt.anchor.set(.5, 0);
	LK.gui.topCenter.addChild(scoreTxt);
	var dragNode = null;
	stage.on('keydown', function (event) {
		if (event.key == 'ArrowLeft') {
			player.move(player.x - 20, player.y);
		} else if (event.key == 'ArrowRight') {
			player.move(player.x + 20, player.y);
		}
	});
	stage.on('down', function (obj) {
		var event = obj.event;
		var pos = event.getLocalPosition(self);
		if (pos.x < player.x) {
			player.move(0, player.y);
		} else if (pos.x > player.x) {
			player.move(2048, player.y);
		}
	});
	function handleMove(obj) {
		var event = obj.event;
		var pos = event.getLocalPosition(self);
		if (dragNode) {
			dragNode.move(pos.x, pos.y);
		}
	}
	LK.on('tick', function () {
		for (var a = rocks.length - 1; a >= 0; a--) {
			if (rocks[a]) {
				rocks[a].move();
				if (rocks[a].y > 2732) {
					rocks[a].destroy();
					rocks.splice(a, 1);
				} else if (player.intersects(rocks[a])) {
					rocks[a].destroy();
					rocks.splice(a, 1);
					if (player.shield) {
						player.shield = false;
					} else {
						hearts[--lives].destroy();
						hearts.splice(lives, 1);
						if (lives == 0) {
							LK.effects.flashScreen(0xff0000, 1000);
							LK.showGameOver();
						}
					}
				}
			}
		}
		for (var b = potions.length - 1; b >= 0; b--) {
			if (potions[b]) {
				potions[b].move();
				if (potions[b].y > 2732) {
					potions[b].destroy();
					potions.splice(b, 1);
				} else if (player.intersects(potions[b])) {
					if (potions[b] instanceof RedPotion) {
						var heart = new Heart();
						heart.x = 50 + hearts.length * 100;
						heart.y = 50;
						hearts.push(heart);
						LK.gui.topLeft.addChild(heart);
					} else if (potions[b] instanceof OrangePotion) {
						for (var i = rocks.length - 1; i >= 0; i--) {
							rocks[i].destroy();
							rocks.splice(i, 1);
						}
					} else if (potions[b] instanceof BluePotion) {
						player.shield = true;
					}
					potions[b].destroy();
					potions.splice(b, 1);
				}
			}
		}
		if (LK.ticks % 60 == 0) {
			var newRock = new Rock();
			newRock.x = Math.random() * 2048;
			newRock.y = 0;
			rocks.push(newRock);
			self.addChild(newRock);
		}
		if (LK.ticks % 300 == 0) {
			var newRedPotion = new RedPotion();
			newRedPotion.x = Math.random() * 2048;
			newRedPotion.y = 0;
			potions.push(newRedPotion);
			self.addChild(newRedPotion);
		}
		if (LK.ticks % 450 == 0) {
			var newOrangePotion = new OrangePotion();
			newOrangePotion.x = Math.random() * 2048;
			newOrangePotion.y = 0;
			potions.push(newOrangePotion);
			self.addChild(newOrangePotion);
		}
		if (LK.ticks % 600 == 0) {
			var newBluePotion = new BluePotion();
			newBluePotion.x = Math.random() * 2048;
			newBluePotion.y = 0;
			potions.push(newBluePotion);
			self.addChild(newBluePotion);
		}
	});
});

===================================================================
--- original.js
+++ change.js
@@ -95,11 +95,11 @@
 	stage.on('down', function (obj) {
 		var event = obj.event;
 		var pos = event.getLocalPosition(self);
 		if (pos.x < player.x) {
-			player.move(player.x - 20, player.y);
+			player.move(0, player.y);
 		} else if (pos.x > player.x) {
-			player.move(player.x + 20, player.y);
+			player.move(2048, player.y);
 		}
 	});
 	function handleMove(obj) {
 		var event = obj.event;