My first impression
You have a terrific idea for a fantasy adventure here. There are plenty of complications to keep the reader interested. There are a few opportunities for improvement descriptions to make it more interesting. But the world you've created here is not just the run-of-the-mill sci-fi earth vs alien setting.

What I liked most
The world you created takes advantage of current prejudices to make the story seem more plausible. Your characters provide a side-conflict such as is expected in modern stories of any kind, which lets us feel closer to the action.

My general suggestions and technical concerns
Even though the narration's telling style makes it hard for the reader to immerse, at an emotional level. That telling style of narration, coupled with the occasional missing word of grammar slip needs a general edit.

Rating and Rationale
I gave this 4.5 stars because, even with the telling narration, it is a vivid, and complex story, and needs very little to make it 5 worthy.