ok i'll upload what i have now as for the saves i'm gonna say a tentative maybe but not 100% sure as i don't know where those stupid errors are located.
EDIT: so here it is my definetly should be complete™ version
You must be registered to see the links
ALSO PLEASE NOTE: I did NOT fix the translation and it is a bit hard on the eyes but admittedly i'm too tired for that it's 3am for me.
this certainly was a learning experience but despite being tedious it was enjoyable and i'm very happy to be able to share a (mostly) fixed version
compared to what was in the OP. a big thank you to
Secret Moofah for the save data that helped me quickly test my gallery shenanigans btw little note about the gallery some cgs look like
as far as i can tell this is intended as it shows you all the layers of the scene sadly mine won't show those but that way you'll be able to see the ones i fixed
edit: will try to ping the people that asked about the patch,
Marauder1175 RagueltheUFO Khaitoh sterdaly Wakabayashi Zippix DrDanzig
edit edit it seems my optional save didn't work while testing on another system so i have attached a save archive from when i was testing which does unlock the full gallery.
edit again: I'm 99%sure i fixed the boss battle crash just dl the patch attached and extract to game dir (yes it just transparent pngs but i tried the fight 20 times and it didn't crash once after i put them there so yay.