Space Zombie Alien

Is a simple shooting game to eliminate the zombie aliens.
Simple shooting game with only two buttons and fun to enjoy.
Middle left -> bomb count, right middle -> bullet count.
Bullet brings the crew continues.
If a zombie is to remove the hearts disappear or go to the middle of the crew.
There are a total of three hearts disappears, the game is over.
It works with Google Play services can share the score.