First of all I would like to say that I love the background images and planets; they look fantastic. The game itself has some pretty tight controls except for some parts where the ship would spin out of control for some reason. I am not sure whether or not this is a glitch/bug, but I thought the author would like to know.
The level design from me gets a 4/5. I liked how he tried to mix it up, however it would have helped to have boosters or other objects such as other spaceships to work with rather than just planets, black-holes, and asteroids. The music fits pretty well with the theme I found it to be somewhat enjoyable 4/5. Overall a well bit game with a few flaws.