If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
The Apocalypse has set in the city you live in. Aliens are attacking Earth, zombies have woken up an you only have your vehicle and a weapon to fight with and escape. Your only chance of survival is getting to the forest in time, where zombies and aliens are not interested in entering. Shoot every enemy on your way and be careful not to crash your car or get shot at. Collect power ups to help you and upgrade your vehicle between levels. Have a lot of fun!