Nice game overall definitely enjoyable as is, but I do have a few notes.
First of all, I could do with a bit more contrast on the asteroids as it can be tricky to see every thing. Also, a bit more explanation on the engines breaking could be helpful, At first I thought the engines were breaking from getting hit by a rock I didn't see. Lastly some orientations of rocks will make it so an asteroid leaves the view of the camera and then rotates back in frame with no warning.