I almost solved it a few times, perhaps I needed 1 or 2 extra moves. Two feature requests:

It would be nice to be able to see a replay, sometimes I got a good 2 or 3 fists moves and I'd like to repeat them. (I don't like undo!)

Add an easy mode, I'd like the same rules and number of moves but a smaller board. Other method is something like 24 moves for 1 star, 20 for 2 stars and 16 for three stars.