This game is pretty engaging, as far as space mining games go. It's rather straightforward - it's a shame that you didn't have time to make it space wrecks instead of asteroids - but that's game jams for you. I still had a good time with it, though, and it has a lot of small touches that add a lot. (Like the upgrades actually being visible on your ship, or the particle effects, or the fact that you can actually select multiple upgrades at once.)
Good job!