Can someone with a fully unlocked gallery paste the contents of their GalleryData file? It's found in AppData/LocalLow/OhSoHero!
It seems to record which scenes are unlocked by generating a list of codenames for each scene and is therefore somewhat difficult to manually edit without significant work.
For example, my current list on a nearly fresh save is
["Daku_AttackSexyTaunt","Daku_Joe_PSE","Joe_Swooned","Daku_Joe_CSE","Daku_KOed","Daku_Joe_PSP","Joe_AttackSexyTaunt02","Joe_AttackSexyTaunt01","Amaru_Swooned","Amaru_Joe_CSP","Daku_Swooned","Daku_Joe_CSP","Amaru_Joe_CSE","Amaru_Joe_PSE","Amaru_KOed","Amaru_Joe_PSP","Jack_Joe_Sex","LoadingScreen_02"]}}