I think gallery is buggy in the Android version, unlocked scenes becomes locked again after playing some time for some reason. I unlocked and seen every single scene but last 2 were still locked at the end. IDK if this problems exist for the other versions of the game though.
Apart from that holy shit this game is awesome. Characters are engaging, story is ingenius and general optimisation of the game is great. Please don't stop doing what you're doing!
Also, protect Annie at all costs. I think she deserves more screen time than what she has now, or I just can't get enough of her lol, absolutely brilliant character.