I like it, but I eventually got to a level where the black hole behaved like a purple planet, and the level was unwinnable. It's the one where you start in the bottom left, and there's a purple top center, and the black hole is bottom right, with an asteroid field between you and the black hole, so you have to go around the purple one and swing into it from there. The little planet enters it, and then shoots off at a random angle.
Aside from that, it's a great game. I wouldn't complain about having some music added though.