The colors play a significant part to this scary animation. The pumpkins are painted purple so as their insides glow bright orange, there's a strange sense of something unnatural and unusual. The unfamiliar positioning of all the pumpkins in a graveyard also add to this feeling of unfamiliarity and suspense. The moon glows on the yard, being the only main source of light other than the eerie pumpkin faces.
As the camera moves forward you can't help but shrink up your shoulders in fear.