I'm absolutely impressed by the quality of this! Stellar composition job and world-building, this tells a very compelling story from beginning to end. From a technical point of view, all your instruments sound super organic with each one being brought at the opportune moment and they were mixed together very nicely, I can't even begin to imagine how much time this has taken you.
I really enjoy the harmonies you chose, they really sound outer-worldly which complements your thematics perfectly. More broadly, your choices in composition and arrangement are very creative and it definitely sounds like you have your own style so bravo on that!
The only nitpicking I would give is that some of your strong moments don't sound as strong as they could. Especially when using percussions and horns I would say you can push them a bit further in those higher registers. Layering also helps bring some fullness to the more intense tracks!
Apart from that, what an amazing experience this was, you really took me on a complete journey. Stellar job!