Avoid threats that come upon you. Use the arrow menu to move the ship from top to bottom.
Your best defense is to attack. Shoot pressing the free zone of the screen of your phone.

Accounts with health 9 points which can measure circles looking top left of the screen. As you go losing health circles change color:

Green: Everything is fine.
Yellow: Be a little more careful.
Red: You are in danger.

You can regain health points taking the hearts on the screen, but beware, if you shoot them disappear.

Fight for survival! Good luck.