Really nice implementation of theme - simple, but quite enjoyable. Looks like there are issue with door opening being not visual - it looks still closed but you can pass through it afterwards anyway. Elementals also path right through. And final puzzle exit didn't trigger ending and I was able to explore around! Or maybe I didn't do puzzle right and just passed through the door without it, bugging it at the end. But I can see it being real good puzzle game once fleshed out with more levels and puzzles!