I like the idea of this one. It ran around 30fps on my dev box, I'd probably have a few choices for res's on the actual release. It looks like it's running in a fairly high res or perhaps it's using desltop res? In any event, have a 640x480 or 800x600 mode if possible. ;)
This could end up being a fun screensaver, keep at it!
This could end up being a fun screensaver, keep at it!