Chrysalis-Dx is a different kind of game. In it you control three important environmental variables. Available Food, Temperature and CO2 level. As you adjust these level during the course of the simulation, you will be controlling the path of evolution. It won't be easy because as more species start sharing the same environment, competition for food becomes inevitable. Some species have special traits that helps their own but not the competition while others have traits the hurts the competition but offer no direct benefit on its own.
Chrysalis-Dx is a causal paced simulation which can run in the background while you do real work. It can be the perfect distraction while you take those 5 min breaks. Check up on your species, adjust the environment and see how things play out.
This game should be out starting August 9 2010 and will have a demo available.