I really had a lot of fun with this game! It has such a lovely and simple art style which really reminds me of old flash games I used to find on Newgrounds.
The core game loop of going into the dungeon and then leaving again is very simple but very effective and has lots of room for expansion in terms of traps and enemies. I did come across what I think was a bug where I could leave the level without collecting the treasure on the 3rd level, but I thought you might have kept that in as a feature just for the jam so you can skip levels. I could definitely imagine other later levels in the style of different ancient civilisations like egyptian pyramids or Inca tombs. I also think the boulder from Indiana Jones would make for a fun trap.
Really cool game!