On level 24 in the hidden cave (the one you use the guards key to get into) A "King Skeleton" is guarding a chest, I think he's impossible to kill. I wiki'd it and he has like 20,000 health! So cheap
Alright, the game is fun but it's far too easy. Since there is no actual designated way to beat a single level, you can just randomly place the bombs and hope for the best. Otherwise, well done 3/5 (Which in my opinion isn't bad)