I enjoyed this one quite a bit. The concept is really unique and brave, and at no point it feels like it detracts from the fun puzzle-like experience. Got an uncanny sense of atmosphere from the shadow people just walking in front of me out of nowhere, to the point it felt a bit like an horror game lol. The presentation is really good, I wonder what a game like this would look like if it emphasised those creepy shadow people even more though.
Great job!