Virus Invaders

When we think of ET's, we always think of advanced beings, with high-technology and unlimited knowledge, that could easily overpower us if they were hostile using brute force with their superior technology against us.
It was realized that they are hostile and are attacking us.
The aliens have invaded us, and are in all the computers over the world. They know everything, could invade any system, no matter its security.
They sent a computer virus that infected all the computers on the planet.
Your mission is to destroy them all before it's too late.
Good luck!

This game was made after reading and studying the book: Beginning Android Games, Publisher: Apress Author: Mario Zechner.
As a way to thank the excellent book by Mario Zechner, I kept the same music that he recorded with his friends and that was used in the last game of the book: Android Invaders.