No, think of it as SS2 in an ecosystem. You're a human who must adapt in to an alien world, by changing himself with the biomaterial found in it's various creatures. The premise is that an ex-nazi bunker is uncovered and the researhers find that it's been used as a testing ground for various 'enhanced' species, but somewhere on the way the sh!t hit the fan and the beasties conquered the bunker. Now, thanks to speeded evolution and highly-adaptable genome, it's buzzing with new life and the protagonists is thrown in the middle of it unaware. Your mission is to survive and that's done by examining the food chain and, in a sense, trying to live in the world. Of course, as it's SS, lots of high tech and guns are involved.