Echoing some of the other sentiments here, I think this could easily be expanded to better fit the amount of material within, and that this would definitely work wonders as a solo stealthy module. Headings, labels, and layout are definitely skills worth cultivating, and I would recommend taking a look at Clayton Notestine & Exeunt Press’ blogs for advice on that front.
The hand-drawn art is charming, and the dungeon delve through the mine evokes lots of traditional imagery re: evil cults & mad wizards. Great work!