Not gonna like at some point I was starting to wonder if the cookie is a myth XD. I'm impressed with how big the dungeon is, I question if it was endless and thinking would you do that? make it procedurally add more room after the first view rooms. Tried a couple of runs without breaking the portal but alas I destroyed the portal and just risk it for the biscuit, seems like the play in the end as it gives so much boost to your stats.
Things to improve wise it seems the other comments have mention what I want to mention, like the UI could indeed be better.