If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Control a tiny ball of grey goo which eats everything around it. The more it eats, the bigger it gets! The goo eats anything that gets in its way: dirt, bacteria, bugs, mice, cats, cars, trees, houses. Everything! Soon the entire planet will be eaten by this crazy ball of goo. Fortunately you're on the goo side.