This is an amazing app, extremely underpriced for what it delivers! One thing I'd love to see is the ability to do profiling, so I can see exactly how much time was spent in each function invocation.
It is also nice to see how much great work is going on WebGL these days[1]. Hopefully, tools like this will help even more create amazing things with it.
[1] http://metaphysicaldeveloper.wordpress.com/2013/04/23/webgl-...