This is a good concept. I wish the asteroids were a little easier to throw - especially the small ones, and I found it challenging to tell when new rocks appeared that I was able to throw. Making them stand out more from the background or highlighting them when they spawn would have been appreciated.
Good work with the ship's AI, it plays well and has a decent level of difficulty. I thought the gameplay was a little one-dimensional and the game could have used some added feature for spice but obviously the time constraint makes that difficult.
Nice job