var Snowflake = Container.expand(function () {
	var self = Container.call(this);
	var snowflakeGraphics = self.createAsset('snowflake', 'Snowflake', .5, .5);
	snowflakeGraphics.width = 10;
	snowflakeGraphics.height = 10;
	self.speed = Math.random() * 4 + 2;
	self.move = function () {
		self.y += self.speed;
		self.x += Math.sin(self.y / 100) * 5;
		if (self.y > 2800) {
			self.y = -10;
		}
	};
});
var FloorTile = Container.expand(function () {
	var self = Container.call(this);
	var floorTileGraphics = self.createAsset('floorTile', 'Floor Tile', .5, .5);
	floorTileGraphics.width = 200;
	floorTileGraphics.height = 200;
});
var IceBlock = Container.expand(function () {
	var self = Container.call(this);
	var iceBlockGraphics = self.createAsset('iceBlock', 'Ice Block', .5, .5);
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.createAsset('player', 'Player character', .5, .5);
	self.velocity = {
		x: 0,
		y: 0
	};
	self.speed = 5;
	self.shoot = function () {};
	self.moveTowards = function (pos) {
		var dx = pos.x - self.x;
		var dy = pos.y - self.y;
		var magnitude = Math.sqrt(dx * dx + dy * dy);
		self.velocity.x += dx * self.speed / magnitude;
		self.velocity.y += dy * self.speed / magnitude;
	};
	self.moveAwayFrom = function (pos) {
		var dx = pos.x - self.x;
		var dy = pos.y - self.y;
		var magnitude = Math.sqrt(dx * dx + dy * dy);
		self.velocity.x -= dx * self.speed / magnitude;
		self.velocity.y -= dy * self.speed / magnitude;
	};
	self.move = function () {
		self.x += self.velocity.x;
		self.y += self.velocity.y;
		self.velocity.x *= 0.95;
		self.velocity.y *= 0.95;
	};
});
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.createAsset('bullet', 'Bullet', .5, .5);
	self.direction = {
		x: 0,
		y: 0
	};
	self.speed = 10;
	self.move = function () {
		self.x += self.direction.x * self.speed;
		self.y += self.direction.y * self.speed;
	};
});
var SnowManEnemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.createAsset('arrowUp', 'SnowManEnemy Character', .5, .5);
	self.width *= 2;
	self.height *= 2;
	self.speed = 2;
	self.move = function (player) {
		var dx = player.x - self.x;
		var dy = player.y - self.y;
		var magnitude = Math.sqrt(dx * dx + dy * dy);
		self.x += dx * self.speed / magnitude;
		self.y += dy * self.speed / magnitude;
	};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var iceBlocks = [];
	var blockSize = 200;
	var worldWidth = blockSize * 11;
	var worldHeight = blockSize * 15;
	console.log('Game world size:', worldWidth, 'x', worldHeight);
	console.log('LK.stageContainer.height:', LK.stageContainer.height);
	for (var i = 0; i < worldWidth / blockSize; i++) {
		for (var j = 0; j < worldHeight / blockSize; j++) {
			if (i === 0 || i === worldWidth / blockSize - 1 || j === 0 || j === worldHeight / blockSize - 1) {
				var iceBlock = new IceBlock();
				iceBlock.x = i * blockSize;
				iceBlock.y = j * blockSize;
				self.addChild(iceBlock);
			} else {
				var floorTile = new FloorTile();
				floorTile.x = i * blockSize;
				floorTile.y = j * blockSize;
				self.addChild(floorTile);
			}
		}
	}
	var player = self.addChild(new Player());
	var playButton = self.createAsset('playButton', 'Play Button', .5, .5);
	playButton.x = worldWidth / 2 - 100;
	playButton.y = worldHeight / 2;
	playButton.width = 400;
	playButton.height = 400;
	playButton.on('down', function () {
		playButton.visible = false;
		LK.emit('playButtonPressed');
	});
	var bullets = [];
	var enemies = [];
	var enemySpawnInterval;
	var bulletInterval;
	LK.on('playButtonPressed', function () {
		enemySpawnInterval = LK.setInterval(function () {
			var snowManEnemy = new SnowManEnemy();
			snowManEnemy.x = Math.random() * worldWidth;
			snowManEnemy.y = Math.random() * worldHeight;
			enemies.push(snowManEnemy);
			self.addChild(snowManEnemy);
		}, 2000);
		bulletInterval = LK.setInterval(function () {
			var bullet = new Bullet();
			bullet.x = player.x;
			bullet.y = player.y;
			var pos = {
				x: 0,
				y: 0
			};
			pos = lastTapPos;
			var dx = pos.x - player.x;
			var dy = pos.y - player.y;
			var magnitude = Math.sqrt(dx * dx + dy * dy);
			bullet.direction.x = dx / magnitude;
			bullet.direction.y = dy / magnitude;
			bullets.push(bullet);
			self.addChild(bullet);
		}, 2000);
	});
	var snowflakes = [];
	for (var i = 0; i < 10; i++) {
		var snowflake = new Snowflake();
		snowflake.x = Math.random() * 1800;
		snowflake.y = Math.random() * LK.stageContainer.height;
		snowflakes.push(snowflake);
		self.addChild(snowflake);
	}
	player.x = 330;
	player.y = 300;
	LK.on('tick', function () {
		player.move();
		for (var i = 0; i < bullets.length; i++) {
			bullets[i].move();
			if (bullets[i].x < 0 || bullets[i].x > worldWidth || bullets[i].y < 0 || bullets[i].y > worldHeight) {
				bullets[i].destroy();
				bullets.splice(i, 1);
				continue;
			}
			for (var j = 0; j < enemies.length; j++) {
				if (bullets[i].intersects(enemies[j])) {
					enemies[j].destroy();
					enemies.splice(j, 1);
					break;
				}
			}
		}
		for (var i = 0; i < enemies.length; i++) {
			enemies[i].move(player);
			if (player.intersects(enemies[i])) {
				LK.showGameOver();
			}
		}
		for (var i = 0; i < snowflakes.length; i++) {
			snowflakes[i].move();
		}
	});
	var lastTapPos = {
		x: 0,
		y: 0
	};
	stage.on('down', function (obj) {
		var pos = obj.event.getLocalPosition(self);
		lastTapPos = pos;
		player.moveTowards(pos);
	});
});

===================================================================
--- original.js
+++ change.js
@@ -170,8 +170,11 @@
 			}
 		}
 		for (var i = 0; i < enemies.length; i++) {
 			enemies[i].move(player);
+			if (player.intersects(enemies[i])) {
+				LK.showGameOver();
+			}
 		}
 		for (var i = 0; i < snowflakes.length; i++) {
 			snowflakes[i].move();
 		}