Also, an adventure game taking place on a frontier, after a civilization collapse, where the only currency is SNES carts. (This idea came from an inspiring tweet from someone who I unfortunately forget!) The ultimate goal is to find the undergroud ruins of a Best Buy containing hundreds of boxed, unsold copies of Earthbound. In the meantime, you could run a mine to dig for buried carts, flush copies of Shaq Fu down the toilet to increase their value, etc.
If anyone wants to fund my stupid ideas, please let me know.