I like the idea and the sprites are really well done, but I think you could use more feedback to the player about when the murderer is going to turn around, the exclamation mark is constantly present and the time it takes seems to vary wildly.
Also it seems that you die as soon as he turns around, which not only makes the game maybe too difficult, but it also means you don't actually see him turn around before the level resets, making it unclear whether you were caught or the game just bugged.
Great job!