Hey, what are those fast and and jumping zombies doing in your backyard? They're not looking for your plants, but they're out to kill you, so grab your weapon and shoot them back to where they come from!
Use A/D or the left/right arrow keys to move. Press W or the up arrow to jump. Use the mouse to aim and to shoot. Press R to reload your weapon and on 1, 2, 3 or Q and E to change weapon.