Graphically, sound-wise this is really nice.
The gameplay was kinda wierd, but I actually quite enjoyed it overall. I'd comment that while the planet orbiting thing is neat, it's actually pretty annoying when rotating the system as it kinda fucks with your sense of where you expect the planets to end up.
The difficulty is kind of all over the place, some rocks you get basically no time to react to.
I don't like that in order to obtain an upgrade or move on, you have to use your mouse to select buttons. This wouldnt be an issue but its the only way you can avoid rocks, which leaves you with an awkward choice between "don't die" and "interact with the buttons" which is kind of lame..