That was so sick! The immediately fell in love with the concept and premise. It's a super cool idea, and think the mechanic you chose fit really well. it was fun trying to maximize your loot to weight ratio in order to make it out.
I would have liked to see some more exploration of the weight mechanic, I liked the two different enemies that presented two different challenges (running from bats, and dodging fireballs), but I think adding some more elements would have made for some more interesting levels (maybe some timing based spike traps?). Also, I felt I never was in any danger of dying, and often I was just able to take a hit and keep going through the immunity frames (maybe only 3 hits instead of 6?)
Over all though, I really enjoyed it. It was quite fun, not to mention the insane amount of polish that was put into the sprites and the menus, and the interface. Well done!