Overall very good!
Graphics can be way better, I don't personally think that moving planets around with a spaceship into black holes or whatever these were is a good idea also. But it required a lot of thinking, the concept is not new, I've played something like that on a 8-bit computer probably 15 years ago, but the level designs were really well thought of and progressed in difficulty in a nice way, so you get 5/5 and 9/10.