Cristgam
Lurker
Defends Earth is a free game where you must keep safe from destruction during 50 alien attacks.
We handle a laser shield on the planet to deflect attacks while you try make perks for counterattacking with your own weapons.
Game difficulty increases as waves overcome. Highest levels are a real challenge.
Ideal for playing a quicker games, because according you clear waves, the game auto saves and the next time you open the app, you can continue where you left.
A real challenge if you want to reach over level 50.
You can download it here: https://play.google.com/store/apps/details?id=com.cristalgames.earthdefense
Enjoy it!