 If you liked
Pale Cocoon
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 ...then you might like
Cocolors
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(Without spoiling anything) Both are about post apocalyptic "societies" trying to survive and figure out the world they live in. Similar themes and environment designs, though Cocolors is much more "fantasy" in it's approach. They both invoke similar moods by the end. If you crave a short but clever movie to watch quickly but think about for a while after, either of these will sate that hunger.