I found this amazing game engine for creating shoot em ups with 3d graphics. http://blog.livedoor.jp/stgbuilder/
Unfortunately it's in Japanese so people that don't speak it can't use it.
It would be amazing to get a team together to translate it, i also think there would be bigger market than me for this of course.
I hope you have innovative new ideas to revitalize the scrolling shoot em' up genre, because it's been a dead horse for nearly two decades.
People only like Touhou shoot em ups because of the cute girls.