I really liked the ambiance , something about how the light in the sun interacts with the earth, asteroids and specifically how it interacted with the hands gave me a....weird eeire feeling...I don't know how to describe it, plus the music helped too.
The game itself is cool, I like the concept although I would've liked to see through the comet I had picked up, because my first instinct was to throw it to other comets or the sun hahaha. I don't know if you have anything scripted to happen if 2 comets collide but I think would be cool, and maybe for the sun too.