Beautiful, relaxing game. The song is quite serene, and the models are pretty clean. There were two details I also liked:
1- The way angular velocity works. Due to its conservative nature, it's a bit unwieldy to use, which is nice.
2- I'm unsure if this actually happens, but I got the impression that for every previous death a "spaceship debris" appears somewhere in the map. If this is the case, I really liked that touch.