The video posted by the developers is pretty deceptive in regards to actual performance. The video posted on youtube (Ilinked n the OP's post) seems to have been captured directly from the frame buffer. It's very likely that the video was not being rendered on an N900 when captured and probably on desktop hardware in order to achieve that smooth 30fps. I've seen videos of people playing bounce and I've been able to see the constant lagging. I'll tell you this, it's not a constant 30fps, more like 5-15fps but it's pretty impressive for a handheld to pull off graphics like those.