Amazing game but there is still room for improvement.
SPOILERS BELOW
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After you fight the Stranger in his mind you should make it so if the player leaves his mind through the teleporter it should change the marker back to the portal instead of pointing to where it is physically on the map.
so you have the marker on the exit when in the strangers mind
but when you use the teleporter the marker is put onto the teleporter to avoid confusion.
Also having an option for mouse smoothing would make the game feel much better for some players.
Also I understand that you don't want players to run away from the zombies every time you encounter them but you shouldn't have them spawn right in front of people randomly.
It ruins the immersion and got me killed a number of times while going through the train.
Instead have them respawn from their normal areas instead of in my line of sight. or at least further away so that it won't be a deathtrap for the player and keeps the immersion.
I cannot think of anything else that could be used as an improvement but I am thoroughly impressed so far. Well done to all involved and I hope to see more in the future! :)