The plot is so original yet simplistic, I thought I heard it somewhere else. It turned out I haven't. At certain points I felt the anime had that Evangelion essence.
What I liked:
-The pace is simply perfect, and this is what I like the most about the anime; probably the best thing about it. Everything progress within a perfect tempo. I never felt bored at any time because I was watching useless content in the story progression or because the narrative was focusing too much on a character's drama (as most of the anime out there does, iugh).
-It has the perfect portion of drama, action, character development, plot twists, etc. Every scene is there for a reason. The structure of the episodes is so well organized, even the episodes titles and the lore facts between scenes.
-It hooks you. You can't blink an eye. Every dialog is so valuable, every epic scene is so intense...
-The plot itself can be used as an analogy of certain aspects of the society.
What I disliked:
-Sometimes I had the feeling the animation were not so good or smooth enough.
