This was an animated film I had seen on TV when I was young. It was about a boy who lived alone on a planet (like the King Kai planet depicted in DBZ) that only had a house with two walls, a floor, and no roof with just a bed and stove. I vividly remember scenes of him making tea and him running then falling over hurting his knee.
He then leaves the planet by capturing a shooting star with a net, riding it through space (while a voiceover narration plays) until he arrives on a desert land and meets a moustached man who is a pilot whose plane has broken down in the desert. Another scene I recall is a sandstorm happens there and the pilot covers him and the boy with a blanket.