Darwinia

Cruising around the net, you stumble into a mysterious computer network called Darwinia, the brainchild of the barely sane genius Dr. Sepulveda. Darwinia is what amounts to a Jurassic Park for programs; small sprites called Darwinians evolve and adapt to their digital environment as its maintainers watch. But despite the fact that you're not supposed to be in the system, Dr. Sepulveda has no choice but to enlist your help. A deadly virus has taken over the system, and in order to save not only billions of dollars of research but also the simulated lives of the Darwinians, you will need to take command of the computer.

Played inside a fractal-generated world inspired by retro arcade games as well as films like Tron, Darwinia requires you to take strategic command of various program-generated units to protect the Darwinians as well as engage in fast and furious action combating the virus with soldiers.