Nice and challenging
I enjoyed this a lot. It is heavy in theme and presents a very consistent play experience. The later levels had my brain smoking. I don't often rate 10s, but I think this one deserves it. The graphics and sound are amusing.
The only suggestion I would have (which may knock the score down to 9.5 but not 9) is to make the arrows clearer when they are obstructed by a monster or treasure. Perhaps there could be a button to hide all obstacles and treasures so you can see the board itself.
Good job on this.