I maneuvered two enemy ships into destroying each other mwahahahaha! I couldn't quite make out how to purchase the upgrades that are listed on the menu screen, maybe I just missed it. A tiny suggestion I'd make would be to have the asteroids slightly different colors based on what element they're going to yield, so if you're trying to chase after a certain upgrade you know which asteroids to mine. But it was still fun to fly around! Nice job.