This game is a masterpiece! Simply gorgeous, both the narrative, art style, sound design, all perfect! My only issue (and you probably read this all the time) is the fact that no matter what you do or say, the end is always the same. I get that this is the intention, to show that the boss was made to be like that and that a player will always beat it in the end, however I feel that, in a narrative perspective, this makes all the dialogue choices we make along the way quite irrelevant. It does not matter if we, as the boss, start to see the player's perspective or not, in the end, it feels like there never was a choice to begin with (which conflicts with all the amazing dialogues the game has).
Of course this is all just my own opinion based only in my own experience, apart from everything I just said, the place of this game should be in a museum, because it's truly an piece of art!!