One of the more unique games I played in a while and very consistent in its dark, abstract mood. Kind of "anime Dark Souls" done in a creative way. Not very approachable, quite hard, especially before you get used to it.
On the other hand, it may be too obtuse for its own good. Near the end of game my play-through was ended when one of the boss fights introduced new transformation mechanics which can get you a bad ending in seconds if you do not now what it does. Nowhere was it explained, in fact I needed to look at YouTube gameplay videos to even understand what happened.
So overall I have mixed feelings. I like hard games, but this one is hard and rough around the edges. It tries to link its gameplay to the plot, strengthening the theme of despair, but for me the irritation it caused weakened the atmosphere.