Inject this shit into my VEINS! Love the front panel art and overall aesthetic. This module introduces a classic premise, contains excellent art, gives great PC/Warden guidance, and gives some concise content warnings.
I really love the formatting on enemy statblocks. Great information organization while keeping real estate down. The Mirror World has a fantastic set of open-ended ground rules that allow Wardens to judge edge cases and for players to create unique situations. Having NPCs already in the mirror world keeps the pace up and creates an easy hook to ramp up the horror/tension.
The “managing coercion” section is such a great inclusion, tons of well-meaning Wardens can still screw this up with D&D brain!
Only question in my mind is whether there would be directional issues in the mirror world since wouldn't left be right, etc. which could get confusing with the one map? Perhaps this works out fine in playtesting, it just occurred as a potential point of confusion.
All in all, THIS HAS THE SAUCE. Amazing work!