I'm not good at these type of games, but I had fun with this one until I gave up after the third or fourth destroyed planet.
Feedback: (because it's a good game worth improving)
I really enjoyed the jump mechanic once I got the hang of it. I liked the point gravity on the planets. A couple of times I died without knowing why. Ran out of oxygen I guess? Is the oxygen counter necessary? I felt like it would have been just as much fun without that.
Once or twice I was suspicious of your collision detection. I could have sworn the missile missed me, but I died. Again, it might have been oxygen. I couldn't tell why I died.
Frequently, I was annoyed that I couldn't jump if my line was even slightly below the tangent of the planet. It felt like I was fighting with the controls for no reason.
The background Audio loop is pretty short, but it was actually pretty good. Not annoying at all.