In the 1960s Mimica moved away from animation (his last animated film was 1971 film The Firemen (Vatrogasci)) and turned to directing feature films, starting with the 1961 Yugoslav-Italian film Suleiman the Conqueror (Italian: Solimano il conquistatore) starring Edmund Purdom and Giorgia Moll.
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He had his directorial and screenwriting debut in the 1952 Yugoslav film In the Storm (Croatian: U oluji) which starred Veljko Bulajić, Mia Oremović and Antun Nalis.