Well, that was surprising. I guess the embryo found a safe place to grow and he raises the child? I guess we won't see a real ending with actual explanations unless Netflix or somebody decides to make a part 2 or 3 of the movie and wraps it up with actual dialogue, motion, characterization and plotting.
Plus, maybe colors other than "black" and "off black". I can see how Girls' Last Tour was influenced by this. If Killy had succeeded and shut off all the systems attacking the humans, I could see how the end result would be Humanity being restored, growing in numbers, then all dying again of starvation and thirst after the surge in population quickly used up the scarce remaining resources, with the result being human vs human violence which would kick off the events of Girls' Last Tour.
Edit: Also, I'm not re-reading this. It makes my eyes hurt.