Vivarium starts out with a somewhat rushed but simple idea that builds beautifully and maintains tension throughout keeping you wondering what next. Then it starts to become odd and this is why I gave it a begrudging 3 stars, it leaves more questions than answers. There is no resolution to the plot and nothing is explained. It's like a sneeze that builds you up then goes flat leaving you wholly unsatisfied. Have a look by all means because it is interesting from a human behavioral perspective and will keep you wondering what's next the problem is you never really find out.