Controls : Keys are : P - Pause/Resume game, S - Start game, M - Mute/Sound. Use mouse to aim crosshairs, left click or key F to fire. If keys don't work, click on the game to give it the focus.
The game : Enemy ships are pursuing your cruiser. Shoot them down before they get close enough to fire. Your shields will protect you but they can only take so much damage. Once they're gone, so are you.
Fast Game: by pressing 1, 2(default) or 3 before game starts, you may multiply your score and damage to the shields accordingly.