The concept is interesting on paper, but the game doesn't make it clear to the player what was going on. At first I didn't understand why the game stops me all of a sudden and then the "I have my revenge" screen appears, until I realized it means that the target saw me and got scared, maybe it needs a scream sound clip to be played or something.
Also you need to show the controls somewhere, I was trying to use the up arrow to interact because the overlay led me to believe that, until I realized it's the "E" key by trial and error.