A lot more fun than i thought it would be
That pretty much sums it up. It was enjoyable, really. However, it never got harder, which kind of upset me. The only exception is that one thing with the anti-gravity things that surround the black hole from all sides except top left and right, which was really the only challenge in the game.
Two ideas:
One, put in gaps in the bottom of the stage, that get bigger with each level passed or something, so that if you fall, you can't just start over from where the lowest platform, you lose a life or some such thing.
Two, only platforms, black holes, and anti-gravs got boring after a while, add more things, like something that if you hit it from the side, it'll knock you to the side fast, so you might fall off, but it'll shoot you up if you hit it from the top.
and Three, it was pretty annoying when i got bounced really high off the top of the screen by the anti-gravs. it wasn't so much of a problem in the later levels, when the camera 'zoomed out', but before then it was a pain in the ass trying to figure out where i would land, and miss 3 or 4 times before i got it right. So if you could do something about that, it'd be great.
If you take all that into account and make a sequel, i'm sure it will be a very successful one. Despite all my criticism, it WAS a fun game, and i think a sequal would be a hit. Good luck!