This game is an entry to the August 2011 edition of the Experimental Gameplay Project.

The goal of the game is to keep an ecosystem going with as little intervention as possible. Each level is a different ecosystem with a number of species in predator-prey relationship shown on the diagram on the right; an arrow goes from each predator to its respective prey(s). The player can kill creatures by clicking on them. A level is won when the population plots reach the right side, and it is lost when either of the species becomes extinct or overpopulates (reaches the top of the plot area).

Source repository