It's a wonderful coda to the original game that expands upon the narrative and gives us a perspective from several characters we know and love, as well as a few fresh ones.
It seems to rely very heavily on the trope that Revenge Is Not Enough....
At several points throughout the game, I felt like I didn't want the character I was playing to succeed.... This includes both Abby and Ellie... It seemed like it was forcing me down a path I didn't want to take, whilst simultaneously telling me that what I was doing was wrong.