I had mixed feelings about this story.
On the one hand, I really enjoyed the setting it established: an immortal, completely transhuman humanity consumed with alien needs and ambitions, but a few biological humans clinging to life on the surface of the planet facing the existential question of biological obsolescence. I mean, I'd have taken it in a totally different direction - I would totally use that as the premise for an awesome over-the-top (or at least hovering near the top) Clark's Law fantasy - but hey, we can't all be me. I thought the characters were all interesting and compelling, and the way they grappled with their fates was interesting.
That does, on the other hand, lead me to my problem with the story. NOTHING FREAKING HAPPENED. I like stories where characters grapple with their fates. They strive, struggle, rise to challenges or fall and fail because of their foibles. What I love about fiction is how extreme circumstances can become an extreme test of interesting characters - what I love about speculative fiction is that it increases the breadth of the spectrum of extreme circumstances and interesting characters. In this story, there was no test and no challenge. It was pretty much:
"Nice to meet you, would you like some explication?"
"Explication! I love that stuff."
"Oh, hey, by the way, a bad thing's gonna happen."
"A bad thing? What are we gonna do?"
"It turns out, nothing."
"That sucks."
And then rocks fall and everyone dies.
I get that not every story can be about plucky heroes rising to the occasion to save the day, or flawed heroes rising to the occasion, or plucky and/or flawed heroes rising and/or falling to save and/or doom the day. But... I don't know. I don't really see the appeal of a story about relatively normal people (albeit, in this case, in interesting circumstances) simply failing... to do... anything.
So, I'd call this one kind of a loss for me. Interesting opening, but no story materialized.