Great locations, great landscapes. The story is captivating. absolutely not trivial. And the same goes with the characters, very interesting, all of them. I liked a lot also the fact that the setting is not the standard "knight" o "samurai" one, so many of the storylines were pretty new to me, and I would guess to most of the audience.
The fight scenes are ok, so does the music. Do not expect too much from dialogue, at the end it's an action movie. I didn't like too much the leading actor, and some FXs (not sure it they can actually be called this way). These however were to me very small flaws.
Overall it was a positive surprise, if you are looking for a cloak and dagger movie, and you are willing to explore not-mainstream channels, you won't be disappointed.