Looking everywhere. Can't find one. Just some multiplayer side scrolling shooters like the old school R-Type, Raiden, DemonStar, 1942.
I can't find any multilayer shmup on iOS. If there is one I can't find it. Toon Shooter has a 2 player mode on the same device but I'd rather have a shmup two people can play via Bluetooth or something. Not on the same device at the same time.
I've found two vertical scrolling shoot em up games where two people can play at the same time via blue tooth. The company/developer is Blusped, the two games are Starfire HD and Thunder3 Online. They both have lite versions.
I like Starfire better out of the two. Seems to have a more polished fluid gameplay.