While I've been revamping my 17-year-old RPGMaker Klonoa fangame that ripped off the plot to Jak 2, I was inspired to blend the themes of Haven City from Jak 2 & The Moon Kingdom of Cress from Klonoa: Door to Phantomile.
Altalune is a crumbling city built atop the ruins of the once floating kingdom of Cress - where the poor huddle together in slums, while the better off live high above.