Dang! This is pretty impressive. I like a good haunted library (underused setting if you ask me), and the combination of 2d and 3d graphics is great. It has a lot of character, I love how all the people are drawn. The limited voice acting really adds to that as well.
Like the previous reviewers, I had some trouble navigating, because of the sharp turns and the limited visibility. That could be something worth taking a second look at. Apart from that, excellent work!