This idea is great, but I'm wondering how the microgame area would work. Would players be stuck inside once the minigame starts so you can't just escape punishment if you're about to fail (or so others can't just jump in the middle of the game)? Like, maybe walls could appear around the door once a microgame starts and they'll go away once it ends.
Also, if there'll be voices for passing and failing microgames, they'd be Kat and Ana's - not Wario's, right? It only makes sense, after all. As for music, the music for Kat's stage from WarioWare Inc. would be cool here, especially a remix.
Overall though, I support this stage - better than seeing WarioWare Inc. everywhere all the time, definitely.