Very creative!
I liked the loop stabilization concept, but I got frustrated with the 3 celestial bodies, I couldn't figure out where to place them... *5 minute check* Well, now I checked the game again and realized that, as it turns out, you can move more than just one celestial body in the game ._.
Because I was sure that I could only move one, because in the first two levels I only controlled one planet. I think it would be worth adding levels with balancing of 2 controlled planets, before those difficult ones with three planets, so that the player is forced to touch both planets.
I barely noticed that the small planets, as it turned out, had an outline.
Or somehow else, but still inform the player of the necessary input data to complete the level.
Otherwise, very nice design and a great idea!