I really dig the models and the atmosphere, which are amazing, especially the forest. You really did a great job on the models part. But you kinda forgot it is listed in the official SCP Foundation that there is a blueish fog, and you changed it to frighten a player later on, but to me it was anticlimactic.
I don't mean to be harsh, but I was met with a bug in my first playtrough, and when replayed properly I was a little disappointed by the SCP noises.
Let me tell you what I mean. The bug was that I started with no sound, so I had no idea there was even a narrator. I walk in, and I get an obstacle. I try to walk around it, and after bumping into invisible walls and wandering for about a minute I make it to the end of forest 1. I go to futher, and my game suddenly ended, which was, that I didn't hear it, of course.
These fake bear noises were quite unfitting. Check this official page for reference, since it is listed in the actual wiki what sounds it makes:
http://www.scp-wiki.net/document-860-i-and-ii
http://www.scp-wiki.net/document-860-iii-and-iv
I like how you animated and thought up a model, which was surprising and uncanny (which scares me out of my chair). I didn't properly see it in the second playtrough, there was a large thing clipping into me so I had to replay in order to see it.
Edit: I forgot to list that the menu music sounds like something from an mmorpg, and it took the immersion away.