Nice and simple (just like asteroids). I like the reverse idea. It's a little on the easy side, though. Didn't had much challenge and never died during my playthrough.
I'd suggest making the "fuel getting" harder. For example, not every crash gives you fuel. When you break a big square it explodes into little ones, but among them could be let's say green squares which are the "fuel" ones you need to break. And it will be good if you have a difficulty curve so the gameplay doesn't get repetitive.