This is RPGM game basically, so RPG-Maker-MV-MZ-Cheat-UI-Plugin works... But need to unpack file "app.asar" (7-Zip has plugin for this). Can leave files unpacked, or pack back with cheat plugin added. In both cases, it looks like game becomes laggy when there's lots of attacks on you, but! Can add or remove items you want to inventory (and forge ultimate weapon with like 300 attack), and/or go towards boss with god mode on.
Of course, cheating like that kills game experience basically. So if just want full gallery, sharing save file is enough.
