The graphics are part of the immersive appeal, as you are playing inside of a virtual world in 3D, and the Darwinian's themselves are 2D. The look has a specific balance to it. If they used a lot of polygons, it would have lost its digital character. Too few polygons, and it would have felt way too 8bit and blocky. As it is, they could have done no better than they have done using simple structures to compose everything you see.
It didn't dawn on me, at first, why my cat was so interested in me playing this game. I later found out the voice of the Darwinians is played by Maddie the Cat. There is no vocal dialogue; everything is textual for the interface and story. The synthesizer music, old-school blips and laser fire, again, perfectly enhanced the gameplay and immersion.