Specimen to most seems to be the best short of the bunch. Though I would disagree, it certainly isn't bad. Acting was good and the twist at the end was unexpected but very much appreciated.
The entire short itself is basically that one scene in Aliens where Ripley and Newt are stuck in a room with Facehuggers. As such, the highlight of the short was making the Facehugger scary again. Being trapped in a dark lab, being only able to hear it scuttling around with its bony legs truly is a terrifying thought, and its played out remarkably well here. Unfortunately, the effect wears off the moment our main character whacks the thing with a shovel like a cartoon. A couple more gripes would be the CGI of the creature when in full view being a little flat, and the music Julie listens to being kind of 'un-Alien', but these are just nitpicks.
Beyond that, the short did an absolutely fantastic job at building tension, but the payoff was not quite as strong as I would have wanted. Still a great short and worth a watch. If not solely for its originality in NOT featuring a Xenomorph as the main threat.