Touch to fire, tilt your device at left, right, up and down to move you fighter.
If you is touched by the enemy ship, your life point will be decreased. Once it's smaller than 0, the game will be over and you lose the game.
You can keep shooting the ships to earn the scores until you dodn't want to continue.
When the game is over, the final score will be displayed. The top score also will display for your reference.