The game is fun, the puzzles are just the right difficulty and you nailed the rewind theme. If you want some feedback:
- the jump sometimes acts oddly (you can't jump when on top of buttons, for example and in some corners).
-the level 4 can be beaten easily with one box
-in the last level, if you stand on the button and then leave, both gate close, and the game becomes uneatable. I don't know if that's intentional, but i feel like it shouldn't be like that
-in the levels in which you can't die, there is no way to go back to the main menu (that i know of)