Wow! Like the other commenters, I agree this is a solid adventure that hits all the marks. It has excellent art, an easy-to-read layout, and is easily usable at the table with minimal prep. I have not taken the time to read in detail, but I can tell this would be a fun experience and an adventure that follows the style of Shadowdark Adventures.
I did notice one thing in what I read. In Area 2, Ritual Chamber, you mention a Cave Crawler, but I think you meant a Cave Creeper.
Very cool stuff!