Pretty fun concept. I think I like that the focus never leaves the crystal, and when it shows you it gives you a little bubble of where you are at in the maze. This works especially well with a maze since you cannot see very far into the maze. The concept of drawing you into the maze so that you can better defend your crystal is pretty neat as well. I want there to be great riches in the maze though. Also, at a certain point, what incentive do I have to continue exploring once I have a bunch of cannons? I can just set there and keep replenishing them. I understand that you want to encoourage the player to keep coming bbback through the maze, but the paradigm shifts as you play and the reload mechanic instead encourages me to stay home and defend. You could put ammo in the maze, but if you are going into the maze to find just ammo seems pretty weak, maybe jazz it up somehow. You could have some fun adding diversity in your monsters and the defensive items you can find in the maze. Sorry for the long kind of rambly reply, this game is quite good and tied together nicely, good work.