your objective is to kill the boss and get as many scores as you can. First, you should load your weapon. Fill your jetpack-mounted cannon by clicking power balls, until the meter is filled. Remember don?t over fill. If you have done the preparation work, the cannon will auto-aim and deliver a devastating blast against your enemy. Don?t fly too long without shooting, your jetpack will overheat. Try to fill your cannon with fewest power balls to get a bonus such as extra time, bonus points, up, etc. If you meet the super boss, use bombs, otherwise, you?d better save your energy. Have fun!