God, I really enjoyed this. The animation is absolutely gorgeous, this should be held up as a masterpiece of the craft, because every frame of this movie, painstakingly arranged, is gorgeous. Combined with the gorgeous music, it's an absolute sensory delight.
If I had to lay any criticism at Kubo, it's that the writing is very on the nose. Most of the movie's major beats you see coming from a mile away, and there's something about the moments of reveal that end up feeling flat, I think because the characters usually don't get enough time to really react (the pacing of this movie feels blisteringly fast at times). However, ultimately, the emotional beats landed, and I teared up at the final scene, so I can't really complain too much about the writing, because it clearly worked.
This movie is an absolute delight. Every moment of looking at it, listening to it, watching it, thinking about it is absolutely charming.