The levels did a great job teaching the game mechanics without relying on words while ramping up the difficulty. One thing I did not really like was the pickups hiding beneath crates that you need to push to get. At that point it became more of a trail and error game to find the intended route instead of a logic puzzle. It would also be nice if a mistake doesn't straight up reset the level but allow you to undo your actions with an undo button. Other than that, great game and quite elegantly designed!