Very simple premise that I felt was executed well. I thought it wasn't particularly scary when I first started, but then felt myself start to get a bit on edge the more I played. However, by the end, I felt less tense and more just focused on spotting the anomalies taking away any of the fear as I became more familiar with what I might see. Overall it does not overstay its welcome and is worth trying out if the concept even remotely appeals to you.