I love that you hit on and were inspired by all the themes. I think the setting of it is great, beautiful, and fun. Seems very open to whatever kind of adventure a group may want to play.
It’s very system agnostic, which is cool but I think it’s good to have a little more definition. I see on a comment below that you planned on building it in 5e. I think that would help people be able to envision it more and be able to adapt things to whatever system they’d like.
I could see having once shots in this setting where you roll for what location, dangers, key characters, and what type of adventures you have and then getting to play it quickly.
Enjoyed reading about the world you’ve built! Would be interested in seeing it develop even more.