I've seen quite a few people on twitter demaking Splatoon for this jam which is awesome. I see in the rules you can't name it what its actually a demake of and I'm trying to think of something clever. I am not a clever person :(
Naming wise, go with something that's a pun of Splatoon. Paint Platoon, Painttoon, Splapainters, etc. Or go with something that somehow describes the game and/or its mechanics. Squidpaint, Paintgunners, Splash, etc.