The idea of a monster following us while we collect the photos isn't very original, but the setting, the movement and also the complements we have make up for it.
If the idea of the game wasn't what it is, the game would be a 9'5/10. I didn't put a 10 because sometimes the movement is uncomfortable for the players.
In short, your game is very polished and it is very amusing to hang out.
I give a 7'5/10, congratulations.