Usually, films about the relationship between a person and a pet focus on this pair overcoming difficulties that seem to come from an external world. Sometimes the antagonist is nature, sometimes other people, but we always have a rather narrow focus on just the two: the person and the animal. Perhaps that's why even the best, most highly-rated films in this genre seemed somewhat boring to me, often even mediocre.
This film is completely different. Yes, we have a boy and his pet, but they are just part of the bigger picture, and the bigger picture, even in its most minimalist form, includes three characters. And this is truly a very kind story, not overly complex, but all the more touching and profound.
In my opinion, "Nicostratos the Pelican" is not heavy or drawn-out; it's a rather pleasant way to spend an hour and a half.