Okay, really liking this concept. In games like this, momentum is important, so it would be really cool if the player had low friction, but high acceleration. That would make it possible for talented players to use barely any fuel at all, but also help with the spacey feel, I think. I'd also love to see more things like boost pads around the world, so I have more stuff to interact with. Pretty fun, I like the grading system, nice job!