 If you liked
Kujira no Kora wa Sajou ni Utau
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 ...then you might like
Kami no Tou
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Both are a brutal yet beautiful fantasy story that is set in an alternative, dystopian feeling world in a kinda isolated entity (you keep wondering for a while what its place in the greater picture might be).
If you love to be taken on a fanciful trip with a lot of emotions, brave hearts, some misteries remaining, awesome animation and some events that leave you wondering a bit about life - this is for you.
Yet they have different style, I'm pretty sure if you love one, you'll enjoy the other one, too.