Make an RPG using 9th Level Games' polymorph^TM (follow the link to the building with polymorph game creation doc) game creation system.

polymorph is a toolkit for game designers to create easy to learn roleplaying games. It's an RPG platform—a tool kit and a set of development assets—that allows game designers to create easy to use and learn tabletop roleplaying games (TTRPGs). As a framework, it eliminates complex systems and esoteric rules mastery in favor of an elegantly simple yet satisfying core mechanic: 

ROLL YOUR DIE TO SEE WHAT HAPPENS.