Amazing game! I loved your take on the theme by modifying the player instead of doing a traditional fail-state reversal. It opened the door to a lot of really cool puzzles and a lot of unique scenarios. The controls felt good and overall it was a fantastic entry.
If you wanted to improve, I suggest having some sort of indication before the player returns to normal. Maybe a flashing effect or a countdown somewhere to let the player know how much time they have left.
Overall, great game!