A nice twist on the "dungeon but you're building it instead of looting" concept, and I liked the stylish pixel art. Liked a bit of writing you have here too.
My main complaint would be that the controls feel cumbersome. Like, I select an item I want to place, I click to place it but nothing happens, especially if there is a ton of loot in that place which I can't really remove.
Also, having a win/lose condition would be nice, I think. Maybe they exist, but I didn't notice that.
Anyway, good entry!