Oscar Lewis’s animation recalls childhood trips to his grandparents’ farm in Lisvane, Cardiff.
The artist, 27, who grew up in Brecon, Powys, said making the film helped him with his severe anxiety and depression.
The Waves was named best animation at the Scottish mental health arts festival’s international competition.
The hand-painted animation, which shows a young boy running through fields, will be shown at festivals in cities including Glasgow and Lisbon.
Mr Lewis, who needed hospital treatment three years ago for a mixture of severe depression and anxiety as well as other issues, said making the film had helped him reconnect with his peaceful childhood experiences.