Demakes (What game would you wanna send back in time?)

[Kitsu]

I figured a whole lot about the gameplay would have to be changed if you want to preserve the fludd functionality to focus more on usage of the device over acrobatics. Of course, at that point, it'd be hard to call it a (mainline) Mario game. Heck, it might not even be Sunshine either, but pretty much a different game altogether.
Note that I suppose it could still have Mario vs Donkey Kong style acrobatics that depend entirely on the A button in combination with multiple different states (e.g. ducking, hanging onto poles, handstand, ec.)