===================================================================
--- original.js
+++ change.js
@@ -1,81 +1,89 @@
-/****
+/**** 
 * Classes
 ****/
 var Hero = Container.expand(function () {
-  var self = Container.call(this);
-  var heroGraphics = self.attachAsset('hero', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.speed = 5;
-  self.move = function (direction) {
-    if (direction === 'left') self.x -= self.speed;
-    if (direction === 'right') self.x += self.speed;
-    if (direction === 'up') self.y -= self.speed;
-    if (direction === 'down') self.y += self.speed;
-  };
-  self.shoot = function () {
-    var bullet = new Bullet();
-    bullet.x = self.x;
-    bullet.y = self.y;
-    game.addChild(bullet);
-    return bullet;
-  };
+	var self = Container.call(this);
+	var heroGraphics = self.attachAsset('hero', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 5;
+	self.move = function (direction) {
+		if (direction === 'left') {
+			self.x -= self.speed;
+		}
+		if (direction === 'right') {
+			self.x += self.speed;
+		}
+		if (direction === 'up') {
+			self.y -= self.speed;
+		}
+		if (direction === 'down') {
+			self.y += self.speed;
+		}
+	};
+	self.shoot = function () {
+		var bullet = new Bullet();
+		bullet.x = self.x;
+		bullet.y = self.y;
+		game.addChild(bullet);
+		return bullet;
+	};
 });
 var Monster = Container.expand(function () {
-  var self = Container.call(this);
-  var monsterGraphics = self.attachAsset('monster', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.speed = 2;
-  self.moveTowards = function (targetX, targetY) {
-    var dx = targetX - self.x;
-    var dy = targetY - self.y;
-    var angle = Math.atan2(dy, dx);
-    self.x += Math.cos(angle) * self.speed;
-    self.y += Math.sin(angle) * self.speed;
-  };
+	var self = Container.call(this);
+	var monsterGraphics = self.attachAsset('monster', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 2;
+	self.moveTowards = function (targetX, targetY) {
+		var dx = targetX - self.x;
+		var dy = targetY - self.y;
+		var angle = Math.atan2(dy, dx);
+		self.x += Math.cos(angle) * self.speed;
+		self.y += Math.sin(angle) * self.speed;
+	};
 });
 var Bullet = Container.expand(function () {
-  var self = Container.call(this);
-  var bulletGraphics = self.attachAsset('bullet', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.speed = 10;
-  self.move = function () {
-    self.y -= self.speed;
-  };
+	var self = Container.call(this);
+	var bulletGraphics = self.attachAsset('bullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 10;
+	self.move = function () {
+		self.y -= self.speed;
+	};
 });
 var Shop = Container.expand(function () {
-  var self = Container.call(this);
-  var shopGraphics = self.attachAsset('shop', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.x = 2048 / 2;
-  self.y = 2732 - 128;
+	var self = Container.call(this);
+	var shopGraphics = self.attachAsset('shop', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.x = 2048 / 2;
+	self.y = 2732 - 128;
 });
 var Door = Container.expand(function () {
-  var self = Container.call(this);
-  var doorGraphics = self.attachAsset('door', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.x = 2048 / 2;
-  self.y = 128;
+	var self = Container.call(this);
+	var doorGraphics = self.attachAsset('door', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.x = 2048 / 2;
+	self.y = 128;
 });
 
-/****
+/**** 
 * Initialize Game
 ****/
 var game = new LK.Game({
-  backgroundColor: 0x000000
+	backgroundColor: 0x000000
 });
 
-/****
+/**** 
 * Game Code
 ****/
 var hero = game.addChild(new Hero());
 hero.x = 2048 / 2;
@@ -83,49 +91,61 @@
 var shop = game.addChild(new Shop());
 var door = game.addChild(new Door());
 var monsters = [];
 var bullets = [];
-game.on('down', function (obj) {
-  var touchPos = obj.event.getLocalPosition(game);
-  if (touchPos.x < 1024) {
-    hero.move('left');
-  } else {
-    hero.move('right');
-  }
+window.addEventListener('keydown', function (event) {
+	switch (event.keyCode) {
+		case 37:
+			// left arrow
+			hero.move('left');
+			break;
+		case 39:
+			// right arrow
+			hero.move('right');
+			break;
+		case 38:
+			// up arrow
+			hero.move('up');
+			break;
+		case 40:
+			// down arrow
+			hero.move('down');
+			break;
+	}
 });
 game.on('up', function (obj) {
-  bullets.push(hero.shoot());
+	bullets.push(hero.shoot());
 });
 LK.on('tick', function () {
-  if (LK.ticks % 120 === 0) {
-    // Spawn a monster every 2 seconds
-    var monster = new Monster();
-    monster.x = door.x;
-    monster.y = door.y;
-    monsters.push(monster);
-    game.addChild(monster);
-  }
-  monsters.forEach(function (monster, index) {
-    monster.moveTowards(hero.x, hero.y);
-    if (monster.intersects(hero)) {
-      LK.effects.flashScreen(0xff0000, 1000);
-      LK.showGameOver();
-    }
-  });
-  bullets.forEach(function (bullet, index) {
-    bullet.move();
-    if (bullet.y < 0) {
-      bullet.destroy();
-      bullets.splice(index, 1);
-    } else {
-      monsters.forEach(function (monster, mIndex) {
-        if (bullet.intersects(monster)) {
-          monster.destroy();
-          monsters.splice(mIndex, 1);
-          bullet.destroy();
-          bullets.splice(index, 1);
-          LK.setScore(LK.getScore() + 1);
-        }
-      });
-    }
-  });
+	if (LK.ticks % 120 === 0) {
+		// Spawn a monster every 2 seconds
+		var monster = new Monster();
+		monster.x = door.x;
+		monster.y = door.y;
+		monsters.push(monster);
+		game.addChild(monster);
+	}
+	monsters.forEach(function (monster, index) {
+		monster.moveTowards(hero.x, hero.y);
+		if (monster.intersects(hero)) {
+			LK.effects.flashScreen(0xff0000, 1000);
+			LK.showGameOver();
+		}
+	});
+	bullets.forEach(function (bullet, index) {
+		bullet.move();
+		if (bullet.y < 0) {
+			bullet.destroy();
+			bullets.splice(index, 1);
+		} else {
+			monsters.forEach(function (monster, mIndex) {
+				if (bullet.intersects(monster)) {
+					monster.destroy();
+					monsters.splice(mIndex, 1);
+					bullet.destroy();
+					bullets.splice(index, 1);
+					LK.setScore(LK.getScore() + 1);
+				}
+			});
+		}
+	});
 });
\ No newline at end of file