Love the idea.
But the game is, I think, way too hard. I barely left the asteroid belt. and every upgrade I chosed didn't seems to increase my chances to make it that much.
The controls are a bit confusing too. pressing backward to shoot is not at all intuitive. and I ended up screwing myself in a bad situation by mixing the controls. I thinking shooting with the mouse & keeping the recoil would have been more intuitive.
All in all. I think with a bit more balancing, & some rework, you have a pretty cool game here. good work ! :)