Have you tried Dariusburst Chronicle Savior? It's one of the highest-production sidescrolling shmups out there. Chock-full of content, too, and supports 4p local multiplayer.Nope, go for it I've been looking for a good modern looking shmup like resogun tbh
If you like top-down, try Ghost Blade HD. I did a 1cc late last year and had a ton of fun practicing for it.
I was just thinking about this Wednesday and yesterday, so I guess I gotta crack my knuckles and get to makin' the thread.
EDIT: posted up the Shmup thread: