random media observation
Of all the shows I'd consider part of the "New Sincerity" (Adventure Time, Steven Universe, Bravest Warriors, Gravity Falls, etc.), Wander Over Yonder is the only one I can think of offhand that isn't founded upon a bunch of coming-of-age metaphors.
I wonder if that's one of the reasons it never quite took off? That and the fact it didn't really have a lot of room for fan-insertion, since Wander, Sylvia, Peepers, Hater, and Dominator were the only fixed points...