Took me a bit of time to figure out the game mechanics :)
I like how you interpreted the theme! The game feels very atmospheric and unique! And I like the audio mechanics that you implemented to find all party members.
Very nice horror experience :)
One thing I've noticed - is the rainfall goes with the player if you walk down.
I would've also added some unique elements and different kinds of trees on the map because that would help to orient and figure out where everyone is.
Great work :)