A few bugs there...
Besides the bug mentioned by SamuraiLover, when an enemy was killed, he still attacks afterward. Also I couldn't buy anything in the second shop or pick up the sword in the house by the third shop. Does the game end after the castle, or is that another glitch? Overall, fun to play, but way too easy to level up and earn money. Put more enemies in the arenas, fix the glicthes and you'll have a much better game.