I really enjoyed the ambiance, visual effects, music and sound effects. I felt like all matched well. The other thing is the controls feel really smooth and makes you feel like you're gliding through space. Feels good! I think I found a bug where some of the light orbs would be outside of view but enough to see the green/blue particles.
I only made it past Mars so I'm not sure if the gameplay changes after that. It'd be interesting to add different elements to the gameplay as you progress further. But to be honest since this is a realistic game, what else is there in outer space other than asteroids? Perhaps, black holes that pull you towards a certain part of the screen? Anyways just spitting out some thoughts!
Congrats on completing your game! It looks great.