This game has a ton of puzzles and mechanics.
My nitpick is that the text animation is annoying because the existing words are not stable, making it hard to read until it finishes (unlike an animation that just fades in one word at a time, keeping the existing ones stable).
In terms of the actual gameplay I go to the puzzle where it said "things are going to start getting tricky". Somehow the game just didn't quite click with me enough to make me want to get over that barrier. Maybe too many different mechanics introduced too quickly? I am not in love with having to physically push other planets around, I liked it more when I just needed to figure out where in the finite orbit they should go. Especially because it makes puzzles sometimes require resets.
I don't mean to just complain, its a very impressive game. Maybe it just needs a more dedicated puzzle fan than me.