The reloading mechanic is a neat idea, though I do think combat altogether is a bit unnecessary since it's almost never worth killing the mummies when it's better to just ignore them. It would be more fun to see in a more action-oriented game. That said, I find both puzzles fun and creative, the gameplay loop of returning sprites to the hourglass is very satisfying (I especially like that you can't see the timer until you get back to the hourglass, which makes moments even tenser), and the visuals look great. Keep it up :)
Also, I might be stupid but I can't figure out how exactly to leave the dungeon and keep my score. I thought it might be through the entrance before the door closes but no. Is there a place I need to find?