I love the old school blue map and AD&D formatting of the adventure.
Some of the murderhobos I've known would hear that a blind man has 1,000 gold and focus on robbing him instead of going to the dungeon. That hook may be a bit distracting as written.
I'm confused by your use of "crepuscular" in this context, as it doesn't match the definition of the word as I know it. Its use feels very Gygaxian, though.
I love the Midas ooze. The XP to gold conversion is interesting, although it does seem like an enterprising player might figure out a way to scoop it up (a resilient sphere or cube of force or something) and just unleash it on their foes to both clear them out and finance their wildest dreams. Extremely fun, though, and an exciting idea.
I also like the structure of the dungeon, requiring characters to visit each of the rooms in the funhouse before reaching the end. Given the way the wishes are handled in this dungeon, the genie certainly does seem like a jerk worth imprisoning.
The way you handle falling into the void is very elegant. While that kind of scenery is very evocative, it's often a pain in the butt to run, and you found a good way to do so here, with kind of a Looney Tunes end to the effect.