This film is magical! The superb animation combines in a spectacular way with a unique style that is both creepy and beautiful. The story itself is very strange, but holds together well and makes for some really interesting moments and characters. The voice acting is subtle, but quite original and very fitting to the characters.
In a sentence:
Definitely worth watching for the originality and general atmosphere, as they're pretty unique. On the other hand, it's a very strange film, so be prepared for that.