That's a fun idea! Sometimes less is more, & it's good to have just one story unlock for it in the gallery. We'll likely add more minigame rewards as we continue development!
you could add a 3rd gallery for secret stories and later on maybe some secret animations, it could be something you unlock on the main screen after unlocking your first secret, and it wouldnt tell you how many there are, but you could see all the secret stuff you unlocked there, it would also give more of a reson for players to travel and do things other then do quests and finish diologue trees, and players would look more closely at things and think more about what could be done, and explore more, i think it would be more fun for players and give a bunch more playability, even if its just a couple secret stories at first