No spoilers just feelings.
A story, the purpose of a good story is to invoke emotions within a reader. You might read a lot of negative reviews that relate to the "enjoyment" of the ending. In true essence a story that is different and unique will make you feel emotions that are unimaginable. This story will do that. I have never felt of doing anything similar to this manga, but I have imagined the perspective. At times it is hard to relate to the main character, but do not let this deter you from engaging with this manga.
A good manga is supposed to make you feel a certain way.
If you love it, it worked.
If you hate it, it also worked.