Good overall, with some really nice little details (such as the asteroids moving in real time)
Really didn't think much of the UI,and the big yellow splash screens between each round though. After the first time I thought they would stop being displayed, but its not really a big deal.
Background assets were hot though, so well done on the artwork!
I do wish that gravity effected the ships too though, perhaps even only when they're moving. It would help with the players hiding from eachother, and help the game universe feel a little more consistent.
Really good overall though, well done!