hey, i'm glad you liked the setting! but nope, all that there is is the stuff in the game. i did have some internal notes (lol and there's a chunk of 'cut content' that's still technically accessible) but nothing particularly extensive.
the next big project i'm working on is a remix/remake of this game, with actual mechanics and graphics and the like, so that will go into further detail for a lot of things, but that's at least a few years from being released.