I really enjoyed reading this one; the map and key are outstanding and seem very easy to run at the table. The visuals ooze charm and draw me in, the words are evocative and the font is very legible while selling the vibe.
*One minor nitpick: I didn't love that you used percentile dice for the guards accepting a bribe, then later 2:6 chance of witnessing cultists escorting intoxicated guests/tossing them into the pit--for Shadowdark, I would have preferred a CHA check for the bribes (Normal or Hard) and tying the potential cult activity to the encounter roll.
Really excellent work!