Doraemon: The Records of Nobita, Spaceblazer (1981)

The twist of hyperspace had been brought about by an accident when Nobita's room connected to Roppuru's spaceship door. Nobita who made friends with Roppuru helps him to cultivate the wild planet where he is settled. On the planet that has far less gravity than the Earth, Nobita is like Superman. He confronts the company that hunts down resources of the planet with his toy guns.