Unnatural Selection

A defected scientist has turned harmless creatures into killing machines. As a fellow scientist, it's up to you to breed creatures that would fight to regain control of the island. Cool animations, and an excellent "experiment" mode. Pretty steep learning curve, although trial-and-error in free experiment mode should reveal what the commands do.

Gameplay
You're set about on the task of creating a breed of tough creatures. After an amount of time is passed you're told it's time and you send a batch of your creations to an island to fight it out with a mad scientists own set of creatures. There are two main ways of eliminating the enemy. Your creatures could either be really tough fighters or sex machines designed to out breed the enemy and exhaust the food supply.