Is There a Lovel Structure in Inplus Plus?

Inplus plus has a level progression system where you play and unlock levels in groups of five. You don't unlock the next bash until you complete all five levels in the group. And you fail when your timer runs out, but you can extend that timer by collecting gold. Is this like a more refined super marial world live system, where you only save at boo houses and bowser castles, which are kind of spaced out every five levels or so?