Extremely zen presentation here, and the puzzles are pretty joyful to get through. Felt like I lost track of time after a while which is a really good sign for a game like this. I see from the description that this is your first time making a puzzle game and I reckon you've got a good eye for it!
One thing I'd recommend is mapping the undo to the z key since it's usually easier to find instead of hunting for u each time I want to undo.
Otherwise though, very elegant entry. Congrats!