well like I said back there I would avoid anything that requires complex physics. Maybe something like an rpg, shmup, or a puzzle game. But if you’re comfortable and you have fiddled with the system long enough, then you can do a lot of cool stuff, imagination is the limit. Deliver something unexpected, an original take on the theme, imho that’s the whole point of the jam. Do not think that your game will be more special just because it’s on nintendo, the game is what matters in the end, so I would avoid cloning, like making another version of pac-man, space invaders, or any other overplayed game.