This is a brilliant and highly evocative adventure. The premise of entering Tartarus to petition thirteen strange wizards is a great hook that perfectly captures the Appendix N spirit. The descriptions of the layers as "psychedelic liminal spaces" are excellent and well-supported by the strange, dreamlike encounters.
The pointcrawl maps are a real highlight; their resemblance to constellations is a clever and thematic design choice. The entire document is a great example of a concise and usable adventure frame, packed with interesting ideas like the town crier who shouts rumours from the party's own past adventures.
The minimalist layout is clean, effective, and works perfectly with the module's overall style. Well done!