Binged through the show, kept myself to 1 episode a day so I'd have time to process and think about it. I really, really, really enjoyed the show its a 10/10 for me. It presents some really huge big concept ideas and lets you spin your own theories about things, which is very cool.
For me, I took the serpents as Necromancer 2.0, created as AIs by an alien race that ended up wiping them out, creating tunnels in the process, etc and some remnant (the "prisoner" in the cube) took advantage of Mother to rebirth itself. Simple and concise, explains all the whispering and hallucinations, everything aimed at that goal.
The first half, especially the world building, is definitely stronger than the second half, where it gets a bit maudlin with "making babies is the most powerful thing a sentient creature can do!" but it was all still extremely compelling. Mother was a fantastic character and actress, I was constantly absolutely terrified by her Necromancer "side" but also really sympathized at times with her character. Just like spiders or allligators there was really something primal about a Witch archetype.
Its too bad the title of the show is so terrible, I think its gonna turn off a lot of people. Otherwise this was an amazing TV series. It reminded me a lot of Dune, Blade Runner, and a touch of Warhammer. No doubt season 2 won't be that good, really only the first half of season 1 was incredible then every episode was slightly worse but I'll still watch.
There's a Raised by Wolves podcast which seems pretty good, only listened to 1 episode so far but it doesn't summarize the show, it talks about concepts like the first episode discusses whether AIs can be moral and the second talks about how feasible it would be to travel to Kepler 22-b.