I don't have any personal experience with thematic or mechanical memory manipulation in RPGs because it requires so much buy-in from players, so I wont comment much on that aspect. Mostly I'll focus on the visuals of the module.
The representation of the phantoms on page 4 is an excellent way to show a reader exactly what the creatures look like without needing lengthy and overly complicated explanations. And the symbols on the final page also look great. I can perfectly imagine laying these out in front of players and evoking curiosity immediately and drawing people into wanting to interact with them. Fantastic invitations to play, both of them. The maps are simple and clean, they leave little room for misinterpretation with clear labeling and make it very easy to visualize the spaces. I just wish more of the module brought as much visual clarity and interest. Bullet points and list formatting own so much space on the pages and creates a lot of waste and blank area. I can see in my mind with just a little tweaking of the image sizes and text structuring being able to let it all come together into something really striking and delightful to read.