Well, not exactly a game, but it was close
One of those bacterium/evolution similuators. Was downloadable online. You'd change variables (food resources, ect) and watch various critters prey on each other and evolve according to changing conditions. If some can be found, I'd be appreciative. Not looking for any in particular, but the one I used to have represented creatures with swimming little skeletal frames, coloured according to the genetic traits they had inherited.
http://www.truthtree.com/evolve.shtml was alot like this, except alot more indepth, with the ability to input your own variables.
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Link!