Great start...
I'm not sure why so many people are giving your game subpar reviews. I think you've definately got something here. The graphics are eye catching, the sound is quality, and fits very well. And gameplay is fun.
As for improvements, I would suggest some sort of way to accelerate the black holes faster than their initial speed, either through say a mouse click, or moving closer, kind of like putting similar polarity magnets next to each other.
Also, if you could script to remove the mouse pointer, so that we only see the green void cursor, that would be good too. Other than that, I think you have a fun 0.9b version game here that could definately make front page with some work. Well done! :3