I just discovered this jam: GoedWare Game Jam Boss Battle Edition where “You are the Boss”: https://itch.io/jam/goedware-game-jam-boss-battle-edition
This is in a broader sense where you could be managing a team or be a dungeon master. However, they also require a boss fight. I think it’s okay if you destroy a wave of heroes, but if it’s 1-to-1, that may be tough to get good gameplay if your boss character only has slow, heavy moves (the reason why Queen of Mortholme works best as a narrative game). An agile boss character like Brevon in Freedom Planet would be cool to control, though.