Sorry, I screw up the save method in one of the versions, make sure you have downloaded this version of the game, then delete your save files (user\AppData\Local\ActionPlatformer\Saved\SaveGames) and try unlock them again. It SHOULD work now, at least it worked last time I checked. Again, sorry for any inconvenience ><
Pd: To unlock the gallery you just need to interact (h scene) with enemies.