Woah... How did I miss this? Must buy a larger SD to try...
Just a couple of personal thoughts...
First full screen 800x480 could be too slow to be playable, would it be better to have 400x240 with pixel doubling?
Second.. well... I forgot while I was writing
I can't wait to get another media big enough to try it, I'm not a coder but if there's some testing to do my n800 is at you service (although maybe a keyboard is needed too...)