Beautifully designed game! Saw it on the livestream and thought it looked good, so came to have a play for myself. Glad I did, excellent puzzle design. Left me wanting more content and a deeper exploration of the mechanics.
The only thing I didn't like was the puzzle where you have to jump from the high platform and detach your legs over the button. It was a satisfying puzzle to work out, but a complicated solution to actually perform. Had to kind of queue up the keypresses and timings in my head first.
One final comment: It'd be nice to be able to see the exit requirements in the level where you have to climb up to find it. I worked out what it must be by the fact that you have to leave something behind on the button, but it still would have been nice to see in advance somehow.
All in all, lovely game!