Go! Newton Cat! Eat The Moon! app icon wip

Another pass at the app icon for Go! Newton Cat! Eat The Moon!. This is a couple of hours' work in Sketch.app (using Tylr's ios7 icon templates). I can already see a couple of things I want to fix (the inside of the window frame needs more contrast, and needs to be thicker) but I think I like it better than the last one :)