Nice idea for a game! I enjoyed murdering the villagers as a ghost, as well as the challenge of having to corner them sometimes. To improve, I would say make the player a bit faster, or perhaps add some dashing mechanics to aid with movement. I could only move in one direction at once, which was a bit annoying if I wanted to go diagonally. Also I found the 3rd level very challenging, and ended up giving up because it was so hard to get to the villagers in the middle (perhaps I just missed something obvious!)
Good job!