From Ben Umstead's Sundance review:
Chloe Rose (from Canada's popular Degrassi: The Next Generation) stars as Dora, a high school senior who, on Halloween, discovers she's pregnant. Unsure of how to tell her boyfriend, Dora's plans to spend the night with him at a party are cancelled when that night's abnormal blood moon rises, unleashing a phantasmagorical storm across her family's farm, which is followed by a legion of strangely costumed trick r' treaters that demand "blood for baby"...Their look is a patchwork circus-gothic vibe that may be the movie's most original and interesting element.