Well done
OK, let's start with first impressions:
Very first impression after watching the whole thing: "I'm going to have to watch this again, to get everything out of it". That's definitely a good thing.
Very professional, and superb use of sound & music to create a dark and scary atmosphere. Some of the graphics could be better (more so at the start - the hand in particular stands out, no shading - you might want to trace a jpg if you're planning on updating this). Good storyline, and, most importantly, a lot of depth to the plot.
*watches it again*
I like the use of French, with subtitles. It automatically creates an 'arty' feel.
Nice touch with the ear-splitting noises to make the viewer jump.
Animation is varied - again, I think it improves as the movie proceeds. The whole saw/corridor thing builds suspense nicely, and the 'sunshine' bits provide excellent contrast to the dark, destructive feel of the 'book' bits. The fact that violence is implied, rather than seen, is very clever, and really adds to the suspense.
Having watched this twice, I'm still not sure I fully understand the story... =)
In conclusion: the three main things that stand out in this for me are the depth, atmosphere, and the choice of music. In terms of suggestions, I'd say spend a bit more time on the graphics in the earlier part of the movie, before the book opens.
Well done on finishing your project, congratulations on a great movie, and good luck on getting awards/FPage.