Im thinking adding skulls to the game similar to halos that either add difficulty to it or just are outright funny like the exploding grunt skull as a example but each skull is hidden and you have to offer it to your girlfriend thing ... honestly it looks like a wendigo and the skulls would fit with the theme. Oh idea a secret ending for collecting all the skulls and having them all active in a single run I call it skulls delight do with that what you will but I'm thinking adding the secret ending that would make the wendigo girlfriend a massive blob of fat just a few ideas off the top of my head