I have so many mixed feelings. I think they can be best summed up as being amazed by the ending, but feeling that everything else was lacking. Like wow, that's so much symbolism, hints, and the "twist" in the last five pages. Emotionally, I am extremely fulfilled, and it's going to be hard to find an ending better than that
The problem is the rest of the story. It was like KAITO knew what ending they wanted, put a lot of effort into making it, but was left with no time to build the support around it. I blame this probably having been axed for having too many hot takes, but still. There were so many characters they could go into, so many events that could have happened in between, so much of their relationships to explore, so many ways to make the ending feel surprising but obvious.
TLDR, amazing ending, lacking buildup