I really like that you've included images from the previous inspiration game -- for full marks I would have liked to see images of the relevant Portal 2 levels (even though I know the ones you're talking about), and also some sketches indicative of how a simple example puzzle might be solved (even though I have of course played your game by this point, and the game does speak for itself--for a fresh reader the awesomeness of the game doesn't quite come across in the document).