I wasn't able to find the killer. I find the space to be a little bit too big it's kind of hard to go looking for one killer out of the many people in a big space. But overall very interesting game. Well done!
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Thanks for the feedback!
I don't think that the size of the map is the problem. I will add mechanisms to get more informations about the traitor. The traitor will make some small noises and you will be able to interact with NPCs, who could then give you some clues, such as, "He is far away" or "He is close by".