I didn't really like the ending. Ibusuki is my favourite character and I was rooting for them.... but this ending didn't satisfy me. During the last chapter I got quite confused, like, "huh? who is this person pretending to be Ibusuki?". It felt quite out of character.
Overall, I love this manga. I think the logic behind the whole series is a pretty well constructed concept that makes sense. I just didn't like the execution of the last arc (though Ebino was really expressive and good in it).