Is there any plans on sharing the improvements made to impact.js with the community? It looks and sounds like you have been able to utilize it and push it beyond its intended purpose. Was there any other game engines that were considered? I have to say this game is awesome, and inspiring in fact. I'll definitely keep a lookout for more updates. I can't wait to see this project in all its finished glory. Thank you for sharing.
I've recently started a project in XNA to see what all the fuss is about. It seems like a great opportunity to create games that you can actually market through the Xbox 360 Marketplace. The actual code is simple making it a good platform for artists to showcase there art in a game format. I truly hope XNA becomes popular!