This is a creative concept. I like how you have to make the adventurer take the longest path to the chest. It was also smart to make sure the player can't block off the chest completely. Though I think it would be better to keep the player from placing the walls instead of deleting random ones. It's also a bit odd that you have to build the maze by placing and deleting 3x3 squares of walls. It might've been more fun to edit the maze with your mouse. But it is cool that you tried something innovative. Overall, good job!