Tap the screen to fire. Play with just one finger.
Defend the aliens' offensive until time runs out.
- 11 different guns;
- 4 different aliens;
- 40 levels;
- Unlock infinite mode;
- 3 Difficulties: Easy - Normal - Hard;

- Reload is automatic, wait for gun to reload. If you tap before reload is complete will reset the reload.
- Bullets are unlimited.
- Be accurate to land headshots and do more damage.