While defeating enemy UFOs and obstacles,please aim at the gate to get to the finish line of each stage.
Fire a shot by touching the screen.
If you continue to hold the screen,the charge gauge will gradually rise to max,and a powerful charge shot will be fired upon release.
Obstacles cannot be destroyed with a normal shot.They must be destroyed using a charge shot.
If successfully hit by enemy fire,your energy will decrease.Running into obstacles will decrease your energy as well.Shoot sparingly when possible.Each shot consumes a little energy,and the game is over when no energy is left.
Blue crystals are a recovery item.Shoot them to recover a little up your energy.