Really great job! This is clearly something that's had a lot of thoughtful writing, time and quality put into it. I didn't feel like it was slow paced at all, the pace perfectly matched the tension and narration. I wasn't bored or disinterested through the whole of the eight minutes, which is impressive because that's a long time for an animated short.
Very nicely written, great atmosphere and has me eagerly waiting for Part 2. Best of luck with the Spooktacular!