This is amazing! The history of the Near Lands really gives a great feel and is an amazing exposition to the music and the story. The short stories are amazing and link together really well and just leave wanting more. The church of Salda kind of reminds me of the Church in His Dark Materials, and the element of Fluxstone has so much potential there, it's just a *flux*mine of stories there to be discovered (get it? hahaha). You developed the characters very well, and it's just a great look into their world in these.
As for the music, it's also great! I love how in the Cael Canopy for example, you used some sort of wind instrument and strings which gives a really nice and nature-y feel to the music.
The jazziness of Valen Shadows really portrays that vibe of the casinos and bars really well and the strings under that are quite pleasant too.
Some small feedback points I have is that the calmer tracks, like Cael Canopy, just don't feel right with the percussion there, as I would describe the percussion as fairly upbeat in that track.
Also, I think making each of tracks even MORE distinct from each other would really emphasise the difference between the cities and I think, make the world much more special (not because your world is generic, but as in giving it a REALLY unique vibe). Maybe you could lean more into the jazziness of Valen, more ambience for Cael, a bit more cheekiness for Salsa, etc.
Overall though, amazing work, the short stories are really good and if you choose to expand on this world, I would love to see it!