So glad you enjoyed the game! I think I know why you encountered that bug, and I wish I could fix it so you could try your 500 monkeys on him! If you still want to test out your 500 monkeys on the boss, go straight to the bossroom without collecting any keys to have more than 2, that should be a workaround. Have fun, I'm really glad you enjoyed it!!! Hopefully I get to work on this more in the future.