Enjoying it so far, but did hit a bug. In the first long hall way with the zombies, on the long staircase before the door, I somehow climbed the railing instead of the stairs.
I climbed all the way up, thinking it was just a display error, but ended up out of sight above the screen (I could see one of his feet still). Walked over to the door to see if it'd fix by me walking through it, and got stuck.