This one is vibing 80's. Lovely dungeon and the overall aesthetic of the trifold surely sells this entry, it is simple as it used to be and at the same time very organized and nice to look at, well put togheter and very on theme, very resembling to older modules and adventures. The text is very clear and readable both in colours and b/w version, It's not too litle nor too big. There is enough content for a one-shot and the content is really easy to find across the document.
I also really like the way you used your theme: a great citation to the watcher by J.R.Tolkien in the water at the entry of Moria. Solid submission