Aftershok is a good game for tablets android. You have to survive in a crazy arcade, to protect themselves from alien monsters who have invaded the Land. They attack in large numbers, and you use the weapons necessary to defend them, they are not admitted to the defensive tower. You need to apply against the monsters electromagnetic guns and rocket launchers, gather resources, to use a super weapon. The enemy becomes stronger each time, you should be ready, collecting bonuses. The game has different levels for different players. Mind-boggling special effects, a large selection of super weapons, and not complex management, great graphics and music.