Great visuals, but I think it lacks in term of Gameplay. Once you set the destination of you rocket... you just kinda wait there. I think a bigger map to explore and a more direct method of travel would really help the game. Maybe make it harder and harder to find new planet to pump the more you advance. It could be like a easter egg hunt on a time limit find all the planet before you consume all the fuel.
But that's just my opinion. You could go in many different direction with this project!