i first watched this just for the sci-fi tag, then it hit me totally off guard with a tragic story of star-crossed lovers.
at first you might think animation and sound are of low quality. but if you look just a bit closer you will find that every picture, every sound, every word has been placed there to evoke emotion. and thus everything fits so well together.
P.S.: twenty minutes is exactly the right amount of time to get your imagination started. don't watch alone and hold hands while watching. you have been warned.