I'll start with saying the writing itself looks good to me, but I'm no expert. With that out of the way, here you go, heavily opinionated feedback.
This sounds to me a bit like the start of a film, rather than something you read. Mind you, this isn't necessarily bad, just a thought I had.
With that said, I personally don't really like the way you started this. I wasn't too sure why, so I thought about it and think it boils down to this:
1: Who am I?
I recognise not all storygames need to be written in second person, but as this narrator seems to be talking directly to someone I wonder who that someone is. It isn't explained within the writing, I assume it's another human who doesn't know whats going on, for some reason, and again the reason isn't explained.
I wonder if I'll be making choices for the narrator, or for the person they're talking to, or heck maybe an alien eavesdropping.
2: Movies are Linear.
This sounds like something that can end up being very linear, which isn't necessarily bad, just something I dislike.
I mean, if this narrator is telling a story, how does it branch? Something worth thinking about, heck you might have it all figured out but it just doesn't come through from what I've read here.
Notice a trend with the two above 'issues'? They aren't really issues, they'd get resolved by the reader simply continuing to read. I can't continue to read, there is nothing else here. So I guess I don't like your introduction because it left me on a cliffhanger... wait, pretty sure that's a good thing for an introduction.
Guess this means what I would appreciate being able to read whatever comes after this, because what you have here is mostly exposition. I'm not gonna question your exposition all that much because one, it's the future, and two, there are aliens. As long as you don't do something absolutely stupid it is pretty hard for me to go, 'no wait, that makes ZERO sense!'
However, here is one thing that stuck out to me personally, just a thought:
I approve of the way you described the aliens, reminds me of the first book from one series I read, in it the 'invaders' weren't aliens, since it was fantasy... actually I guess that depends on your definition of aliens, because they came from another world. Anyway they had insects like armour (that's how I remember it).
Anyway, pretty nice that your aliens aren't literally just humans with better stuff... although I guess that would be an interesting plot twist. I guess the point I was trying to make is, sounds neat.
Any chance you could tell us what the 'story' the narrator will be telling is, just broadly, you don't have to spoil it. Just at this stage you pretty much described the setting without telling us anything about the story other than, well, the setting.
I think adding mythology is perfectly fine, heck it is pretty cool, just be careful with how you do it.
Like not everyone reading will have the same level of understanding regarding mythology, you don't want to confuse people when... idk some guy has the codename Loki so you know not to trust them but not everyone will know that without other hints (but to be fair I feel Loki is pretty well known these days, or at least a certain Loki).
I sorta went on a tangent there, guess I'm saying be careful with how you put mythology into it and it'll probably end up enriching the story.
Overall, this could end up being pretty great, and from what I read here it sounds like it is more likely to be good than bad, which is always a plus. So keep writing? Or maybe write a page and show it again?
I'd like it more if there was more to it (the story, not the introduction). As an introduction this looks good to me. You seem to have the setting well thought out which should help you out quite a bit. So keep writing.
If you want me to attempt clarifying something more, or to be a bit more specific regarding something in particular, feel free to ask/pm me. I feel this feedback is missing some important part, but I'm not sure which one!
Oh just noticed, your paragraph's spacing seems to be bigger than normal, so gonna assume you're using the Rich Text Editor. That's a whole other topic, so I won't ramble about it. Just be careful with the way you format your stuff, don't want it looking too weird (tho really you just want consistency, then it'll be all good). Presentation is important!
EDIT 2 P.P.P.S.
Come to think of it, you might have copy pasted this in from word or something, that can mess with formatting as well sometimes (it does for me at least, tho I use WordPad). Not sure why I felt the need to add this.