Really well made, the game does an amazing job at building tension and I love that it forces you to be helpless in order to progress. I also love the amnesia-esque interactions with doors and such, because it adds another layer of care you need to take while playing.
My only gripe is the mouse sensitivity. It's not very proportionally matched to the drawing mechanic, as it's fine to look around but painstakingly slow to draw the symbol. Other than that, great atmosphere and gameplay.