It has basically no replay value, compared to games like Kittens or Evolve. Every playthrough is basically the same. There are no substantially different strategies, and only at the very end is there a single decision that determines which of two endings (and fairly simple boosts) you get. After one playthrough you have seen 99.9% of the content, after two you have seen 100%
The writing and the story is pretty damn good though.
It has non traditional replay value, because you are absolutely correct in your detailing of playthrough similarity, yet it appears few if any of us are able to ignore its siren song.
The writing and the story is pretty damn good though.