1) I believe that this movie is more like a religious experience than a story about loss and guilt. I don't think it is ambiguous, there is only one explanation. In any case, regardless if i am right or wrong, there are many layers here, Existentialism, Metaphysics, God and, simultaneously, the absence of God. Pick your poison.
2) This is a psychological/dialogue driven drama with mystery and horror elements. If you are looking for mindless fun/gore/people killing each other, you will not like it. You will probably don't like it either if you are under 25 years old or if you don't like movies with religious tone. Filmed in black and white, there are many intense and thrilling moments if you are into this kind of movies. Actors and actresses are excellent, cinematography too.
3) I can understand why the ending is polarizing. I found it great, it's a great and appropriate ending for this movie.
It's not a flawless movie, i would prefer it longer, 90 plus minutes aren't enough for this story to be told and unfold. Some scenes ended abruptly while it was getting interesting. But, overall, it was very interesting and most importantly, somewhat original. I wish other directors can be so bold and courageous in this genre, down the road.
