Hedgewars is pushing a GMA 950 (with an N270@1024x600 or a T5600@1280x800) to its limits. Not sure how the N900's PowerVR compares to that, especially since it's also OpenGL vs GLES, but I can hardly imagine it to be much faster.

That being said, iirc the last attempt of porting Hedgewars to the N900 was before there were serious attempts on getting hardfp support in Fremantle. So a hardfp port should increase performance significantly (still not sure if it would be enough).

btw:
I don't understand why Hedgewars relies on GPU acceleration at all. It doesn't look like it needs to.