I see the movie often being described as slow or boring. Yes, it isn't quick paced, but it has a very good flow where it builds up in anticipation. Slowly yet surely, uncovering the plot and I feel it wasn't at all boring. The movie doesn't hand you the plot, its unique and lures you in because it requires you to be watchful and break down the plot for yourself. Which I personally enjoy. I would describe it as a more so psychological horror.