We just finished the game. I played and read it all to my 8 yo (we are not native speakers, so it was a nice practice). We god The End-ing. :-)
I must say I am pretty happy about it, but my kid is pissed off there was no further info what the Seren was or what was her purpose.... My personal idea is that she was a hyper-powerful militarised AI, that got sentient and disabled herself and that she was culprit of much of the forgotten war that resulted in that garbage heap stations...