I think this might be the first multiplayer game I've seen in this game jam, and it's a great one! I think it's an excellent use of the limitation, and (although I was admittedly playing both characters by myself), I could see this becoming super hectic super fast with two actual human players. I could easily see you expanding on this idea once the game jam is over; for example, you could add power-ups that only benefit the player who actively moved the character into them, or you could make it so that more players can play. (You could have a chaotic game mode where four players instead of two share the same body, and an equally chaotic game mode where two players share one body and two other players share another body, possibly with each body being one team, or possibly with each body containing one player from each team.) Great job!