Very interesting. I liked it and I was very engaged, one of my favorite things being that I didn't really understand the mechanics but I felt I could experiment and explore them. This worked for a little while until I ran out of charges for Smite and had no idea how to cast an attack spell so I just passed all my turns while I got murdered by the undead. I would like to know how to attack.
The atmosphere and mood were top notch, I loved those. The objects on the floor and in the world in front of me felt too far away when I interacted with them. Maybe the tiles are too large or things are placed too far back in the tile. The idea that I could spend spell charges on upgrading my stats was really interesting, I loved that.
Oh one more thing - I think your maze was well designed. It was hard for me to figure out if the levels were switched on or off but otherwise the exploration was very interesting.