This is a really interesting concept. I was hoping for a Kingdom Death: Monster type deal, but this could be a neat game. Though I'm curious what kind of game this will be. Will it be a character driven game or a kind of strategy RP? 

Because if it's a character driven game the players will likely be monsters. However given the ecological hierarchy there's no real way to progress that I can see. If you play as Prey there's no way to become a predator or become stronger. You either start as a Predator and something meaningful or you don't really have any options.