advancing UFO電腦版

Click anywhere on the screen to change direction of acceleration of the spaceship to go through rows of pipes. Between each row , you have two chances to change the direction .It's possible to use only one chance , perserve one for future use , be caution though , it's risky. Be aware , it's direction of acceleration ,not speed . In each row , the interval between the two pipes changed between 4 to 6 * the ufo's radius.