The indie drama Natural Selection — starring actress and comedian Rachael Harris as a suburban Texas housewife searching for her dying husband’s illegitimate grown son (Matt O’Leary) — won Grand Jury Prize for narrative feature filmmaking at this year’s SXSW film festival. The film also took home the festival Audience Award, as well as jury prizes for its screenplay (by writer-director Robbie Pickering), editing, and music. Harris and O’Leary both won Breakthrough Performance awards, along with Evan Ross from the carjacking thriller 96 Minutes. Dragonslayer, about skateboarding culture in Fullerton, Calif., took home the Grand Jury Prize for best documentary feature. (EW film critic Lisa Schwarzbaum served on the jury for the documentary feature competition.) You can watch short clips from both Natural Selection and Dragonslayer below; click here for the full list of winners (which will be updated shortly).