Magnificent as always!
I'm surprised that your stuff isn't rated higher, CG. Sure this may have been based off of Lovecraft, but considering that H. P. Lovecraft is an underused subject on here; I'm not going to whine. Instead, I'm going to explain to why I loved this...
In terms of art and animation: It may look similar to Em Kaah, David Firth, or Waldemar P. Schuur; but still has your distinct touch to it. The frame-by-frame was excellent and I loved the part that looked like an old vector game. Plus, your backgrounds are really spiffy.
In terms of sound: I appreciate the non-use of sound effects, and your music selection is top-notch. However, I would recommend that you check out the Audio Portal unless those songs were from there. And this is coming from somebody who doesn't have a problem with music used from one's CD/MP3 collection.
In terms of content: This was better than that other Black Book cartoon, and that was a rather bad comedy. The pacing was excellent, shots well selected, and the overall direction that is just praiseworthy. Of course, it may not be as elaborate as the original story, but it's just as effective.
What I like:
-Underused subject
-Excellent art and animation
-Great music selection
-Top notch direction
What I didn't like:
-Could have been a bit more atmospheric.
Overall: Here's a nine out of ten from me to you.