Rhythm Heaven Gigamix but every button press except A or a tap speeds it up by 1% 

Every game's controls are treated like their originals in their respective games, and not in Megamix. The only exception is Karate Man Senior, as that variant is exclusive to Megamix. Also, if a game has interchangable input between A and another button (e.g. Rhythm Tweezers), the inputs are treated as regular A presses.
Last "X but Y triggers Z" I'll be doing for a while.