Fun! Cool idea to create the rogue-like level before entering it.
Got confused where the 'end' room was. I was trying to connect to the end by avoiding that scary red skull! Maybe, separate the boss and ladder rooms (keeping them near each other, of course) so player can strategize more: fight boss if he needs the loot or sneak passed the boss if he has gathered enough tiles.
Combat was fun and weapon was cool! Lots of potential I think here for a full-fledged game!