The art and sound design is marvelous. You have managed to create a really good atmosphere.
I'm not really good at this type of game but I think it has a good balance between too many and too little clues.
Some points I think could be improve is to give better feedback when things change, specially when a new person dies. Also, at first I thought that the game screen with the tutorial open was a static screen and I lose 3 people before realizing. I think the game needs a short introduction to "set things up".