Really interesting game and twist on a dungeon! There's a lot of cool ideas in here, the sprites are nice! I feel like the hero teleports around a bit in the boss fight which makes them tricky to hit...
I wish you could scrap or move or recycle objects and I wish you got a little more description on some of the items like the key's one-time use... It also was a bit of a bummer that the hero knew the direct path as I tried to set up some of the side rooms and they became utterly useless until I could buy a key. :P
Still, a really awesome idea and some really nice visuals, I think it's great!