Pick the hero that suits your play style.
You can switch characters during play for a price. Just tap the icon on the left, and cycle through the available power-ups.
Keep in mind that just because a zombie falls over doesn't mean it's dead for good.
Move around virtual button placement to best fit your thumbs. During play, press the icon on the top left corner of the screen, then tap the controller icon. You can now adjust the directional arrows, shoot and jump buttons.
Use double jump (tap button twice) when you want to avoid large groups of enemies and/or survive giant leaps of faith.
Kill a certain number of enemies to earn power-ups.
Head to the Shop and spend coins you earn throughout the game to unlock new weapons, like the Assault Rifle, Shotgun and Rocket Launcher.