Those are fair criticisms, and I appreciate you checking it out. FWIW, as far as the sparsity of treasures/encounters...this is the four-page jam version, and a hypothetical expanded version down the line might maybe flesh those out for the same $2 (or no additional charge if someone's already purchased it).
Viewing post in Lost In the City of Z (Appx N Jam 2026) jam comments
Nice! I think some hints in old journals could be a good way of giving tips to the players around lighting the braziers and traversing the city in a specific way.
This might help as well https://thealexandrian.net/wordpress/1118/roleplaying-games/three-clue-rule