 If you liked
Gwahoheub
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 ...then you might like
Unbelievable Space Love
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Animated by the same studio (and it is beautiful). Both have the same ethereal feeling, with surpassed love. Unbelievable Space Love has a bittersweet and dubious ending, while on the otherhand Hyperventilation has a clearly positive ending.
Oh yeah, and Hyperventilation is sexually explict.