Spirits of the Air, Gremlins of the Clouds

Spirits of the Air, Gremlins of the Clouds is a 1989 Australian independent science fiction adventure film directed, produced and written by Alex Proyas, who was making his first feature debut. Set in a post-apocalyptic world in which two siblings live in a homestead whose silence gets interrupted by a fugitive named Smith. Starring Michael Lake, Rhys Davis and Norman Boyd, the film was shot on location near Broken Hill, New South Wales and at Supreme Studios Sydney and was made with a budget of A$500,000.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.