First of all: node-webkit is a huge improvement, so good job with that! I have one problem though.
You can press F11 to enable fullscreen in my game. This works great in browsers, but it's not working in Node Webkit. The window does expand, but the game itself doesn't. Here's a screenshot:
<img src="http://www.tumbleweedgames.com/wp-content/uploads/2013/01/size.png" border="0" />