When I was building something called Planet Cracker I started to wonder if there was any moral issues with that, then I saw a whole planet blown to bits and I didn't have to wonder anymore.
Such a great game, controlling the ship is great, the progression was fun, and overall it's amazing that you were able to create this in 48 hours, nice job.
My only nitpick would be the lighting, at some angles the asteroids are hard to see, and the bits after they explode are even harder to see, so I'm sure I lost many bits just floating around that I was not near enough to grab them.