Very innovative...
As far as I know, this is a completely original concept, which means you should be commended on that!
Graphics/effects wise, this game was pretty smooth. Good, clean graphics, nice arcade-like sounds, but the music was kind of annoying (even though there was somewhat of a selection).
As far as game play goes, it was extremely difficult, but the concept was great and the physics were really interesting.
So all in all, this game was pretty hard at times (like, REALLY hard!), but it was still pretty fun.
Piiiiiiiiimmmmmmmmp!
-Brian
P.S. The black holes were a bit hard to see, though. No big deal...