Thanks - further changes have been made, and 29/06/19 Fix 1 hopefully addresses it correctly.
To note, if you made a save with an earlier version of the game, the defeated enemy positions won't change as you go back up the tower, but you can walk through the corpses blocking the stairs to make it possible to still continue.
Regarding the gallery, is it a complete freeze or just a really long loading time? I wasn't expecting how long it'd take to initialise once you started unlocking more pages - I'll look into adding a loading screen to make that clearer.