What's "Gamemplay Crossing", dude?
Well, it's a name of my own. I use it in some Spanish forums and with some friends to refer those moments in which gameplay is still the same (no changes in controls, nor in moves or anything like that) but the objective or some aesthetic effects make it to resemble a completely different game.
For example, in this level of Super Mario 3D World, there's a gameplay crossing with vertical shoot'em-ups:
I believe a game by ex-Rare employees and for classic games fans should include this kind of technique in order to bring us a varied, original game.