The rewinding is an interesting mechanic, and I like the twist of a changing environment/gravity within a single level.
The puzzle design didn't really work for me though. I finished most levels by just doing the one thing possible, and rarely hit a moment were I really needed to "solve" a level. I really liked the one where you had to place a clone that's pushed through three doors that you then open one by one, because it wasn't just about placing a clone on the next available button.
I think the game also needs a way of showing how the buttons are connected. Without that, it's even harder to plan/solve a level, and even more a case of randomly trying things. I had to stop on a level where I had 4 clones and 7 buttons and couldn't figure out which ones to press. A related issue is the camera, I think seeing the whole level at once would really help so you can plan your moves.
The controls feel a bit robotic because of the instant movement and the jumps are a little floaty, but overall I think it is fine.
I like the art style and sounds, and the rewinding animation is great.
I also like how you integrated the tutorial into the game.
I think the UI should show the current gravity in addition to the next one just for clarity.