Creative gameplay and nice art style.
The puzzles are a bit too easy to solve once you realize that you can just keep stalling at the beginning, and that way your past self will never get in your way.
If you are looking to refine the game, I think the easiest way to make the puzzles more challenging, would be to count how many steps the player takes, and then make a check once they finish, and sort them into one of multiple categories like so:
-Exceeded the maximum allowed number of steps, level failed
-Adhered to a lenient max step limit, bronze trophy
-Adhered to a stricter max step limit, silver trophy, etc.