Honest review:
The atmosphere, sound design, mechanics all work well. But, the game play is not great. The idea is there, but spamming E a random number of times every minute gets really tedious and adds nothing in terms of game play. I'd remove it completely. It's just not enjoyable and ruins the rest of the game play.
I really wasn't sure how to identify killers. The text "Listen for killers in the dark" isn't helpful, as I couldn't hear anything of relevance when examining npcs through the scope.