Voromoeba

The world of Voromoeba is a series of circular ponds. You are a voromoeba, a single-celled creature who lives in a pond. You must venture forth through the ponds to reach your sweetie! Along the way, you must elude or destroy predators and gather food.

It's an ordinary life for an adventurous fairy-tale protozoan, with a twist: The ponds are Voronoi diagrams. Each thing in the pond is Voronoi cell. The rules behind Voronoi diagrams make the boundaries between cells fluid. Even if you do not follow the math, by playing the game you will get an intuition about how the boundaries behave.