Pizza Tower - 22 - Peppino vs [spoiler]

I mentioned that the previous boss kind of felt like a mirror match. This one is both moreso and... not. Sure, he looks a lot like you and uses a lot of moves similar to yours, but something about it just feels off. And then there's the end of the fight...
First try, though. Not sure if I'm getting better at the boss thing or just got lucky, but I'll take it!
Also stumbling across another weird secret room. Are there more of them, and is there anything more to them than being easter eggs?