If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Launch your zombie to get the longest distance and upgrade your equipment in between the level. Set your power, set your angle and launch the zombie!
Use the mouse key to play, click the buttons to set your power and angle, then launch your zombie. Keeping the mouse button down during your flight will increase your turning speed, use this and release at the right time to land on your feet.