Arrow keys to move, click to shoot. You can go to the shop by pressing p and buy guns there. Try to reach a high score by killing zombies. Notes on zombies: basic - a simple enemy with very low health. strong - a tougher zombie that has double the health. crocodile - the strongest type of peon that has slightly faster speed. giant - has 100 HP but is slow. yeti - has even higher health. dragon - has 5x the HP of the giant. dinosaur - the strongest boss of all with titanic health.
Thanks to Ironbird4 for some of the costumes and Warfame for the tutorial.