Trying to think of titles / themes with incorporating several upper playfields:
Little Shop of Horrors - upper playfields trying to hit targets & dodge the plants arms as they try to knock you off.
Nightmare on Elm Street - Upper playfields can represent different nightmares you are in.
Jaws - upper playfields trying to be on the “surface” of the ocean while the rest of the game play is underwater. A shark fin can be on a track trying to nudge you off. Or it could represent being on the Orca boat.
Piranha - Getting to the surface / out of the water etc.
Killer Klowns From Outer Space - Upper playfields going throughout the circus tent running from / trying to escape the killer klowns.
Fifth Element - Upper playfields can be the floating cars / Chinese delivery service flying boat and you can hop from building to building / platform.
Gremlins - Upper playfields have balls that pop up and “multiply” and fall down when you feed them after midnight, sunlight from the LEDs and get them wet from the main playfield.
Monster Squad - You are in Dracula’s mansion / house trying to get the Amulet on the upper playfields