Nice, simple story with the right amount of subtext (both in title and the ending). Have to admit, when first watching it, I didn't differentiate the 2 worms or understand the wafting ribbon above the male worm.
Maybe if there were a light pink trail the female worm left from the get-go (and in the later ribbon/scent trail), the rest would've made more sense. Also, maybe if there were more of a female worm establishing shot... eh, still worthy of 4/5, GG