Nice concept, but would be better if there were countdown pieces that you had to remove before certain number of moves - that would at least require some planning ahead.
1:100,2:80,3:100,4:100,5:91,6:100,7:100,8:100,9:100,10:100,11:100,12:100,13:100,14:32%,15:43%,16:78%,17:36%,18:56%,19:85%,20:50%. Trick on 13 is a vertical slice on the right, about ½" over.
I had this idea, but one of the game's main principles is that every move is correct if it is done.