The film, on the surface, appears to be an ordinary Good and Evil story, and that's how it actually ends. However, if you think about it a step further, you can see that the boundary between sinners and non-sinners in this film is blurred. Also, looking at the symbols that the movie constantly provides as hints, pictures of "sheep hanging on the tree". It makes you question whether the person who fell off the cliff died because he was a real sinner or was simply a scapegoat who was pushed off the cliff.
And the answer to that question is in the movie. The god "Nororo" in the movie is not a good god who punishes evil. He is just an evil god who eats the scapegoat thrown by the villagers. The director has already hinted that the character thrown into the sea is close to the scapegoat.
In conclusion, this film is about the scapegoat mechanism. And it send the message in a way that deceives the audience. Just as the real society falls into the illusion that the problem has been solved by executing the scapegoat, it makes the audience to experience the same illusion by allowing the most suspicious person to be executed. I don't know if this is the director's intention, but at least it is the interpretation of the symbols in the movie.
I think it's a great movie that tricks the audience nicely by hiding this theme in the cliché, so it's appropriate to give it a full score.