I like the title font, but it's harder to read at a smaller size for the subheads inside. Similarly, I think the adventure would be easier to use at the table with the paragraphs of description broken up into either smaller paragraphs or bullet points.
The brain-shifting mechanic is great and unique. This will be an adventure everyone remembers forever.
That is an optimistic Shadowdark wizard seeking to hunt down a Shadowdark fighter. Not the way I'd bet, traditionally.