Need to find old cartoon sci-fi movie about a lost boy
From what I remember the boy is separated from his guardian and the story follows his travels on a strange planet there is also a side story with 2 small creatures that seem to narrate
Near the end of the movie the boy pairs up with an alien doglike creature that meets its end in a forrest filled with man eating vines, at the end of the movie the boy is saved from some giant insects an drifts off into space on a new spacecraft seen it twice in the early 80s I think