Polished like a diamond. Graphics and audio are excellent, and the control is always just a hair away from being frustrating, which is a line that a lot of games in this style cross to the wrong side of. Even though we weren't able to do better than 1 astronaut remaining, we had a lot of fun trying over and over.
We must have played too much Asteroids, kept trying to hit a reverse thruster, and was really expecting to loop around rather than crash into the walls.
The only change I can really suggest is that it might be satisfying if the meteors were also destroyed in the explosion when you crash into them, but that wouldn't really affect the game at all.
Excellent game.