From Dingo Games:
Control a tiny ball of grey goo with the ability to eat anything smaller than itself. The more it eats, the bigger it gets. Soon you'll be able to eat the entire planet. The story begins with the goo eating a time machine, causing him to be sent back in time. Playing as the goo, you'll eat your way through six different time periods: modern, Late Cretaceous (i.e. dinosaurs), Ancient Egypt, Ancient Rome, Feudal Japan, and the distant future. Each time period features a unique set of objects for you to eat. Mice, cats, Tyrannosaurus Rex, mummies, gladiators, and flying saucers are just a few of the hundreds of objects available for consumption. Levels can span vastly different object sizes; in one level you'll grow all the way from the size of an amoeba to the size of a galaxy. A complete 2-player cooperative game is also included so you'll be able to play the entire game with a friend. After completing the main game you'll unlock a ton of bonus levels that provide additional challenge. If you're really good you can even post your best times on the high score boards to compare against other players around the world. Eat your way through time in Tasty Planet: Back for Seconds.