Battle against level after level of enemies, each with an unique style of attack.
Use your finger to rotate your ship and fire, either tap or hold your finger on screen.
Press 2 fingers at the same time to release a neutron smart bomb that will instantly kill all enemies on screen. Use them wisely as they are in limited supply.
Collect upgrades along the way to increase your firepower, add more lives and increase your turn speed to name a few.
If your feeling brave, shoot the enemies when they are within your red circle zone to receive an extra bonus.