The korps is weird in that it bucks the popular trend of Art at the zenith of media, where in turn within the korps the writing involves and drives the art. So plan is to finish what I can of the story, and use that to inform what the game will be like, and do each chapter as its own game instead of having one large title.
I've seen other developers do this to success because its easier to work with modular pieces than having one big engine to poke, and prod, which runs the risk of breaking everything.