The Fountain of Dreams is a stage that orginated in Melee but it finally returns in Ultimate. It's based on the Fountain of Dreams in Kirby's Adventure.
Though while I like it, it's a simple stage without much to do.
Not really any true hazards on this stage either. Though without much room to run or hide, you can truly see who's the better fighter here.
Though all it really is, is a pretty version of the Battlefield stage set in the Kirby universe.