A free app for Android, by Limbic.

Tower Madness 2: 3D Tower Defense is a free strategy game in which you protect a flock of sheep from alien attacks in an apocalyptic world. It’s the sequel to the hit tower defense strategy adventure TowerMadness, in which you have to defend your castle and win the battles in order to save your village.

You will need to quickly think up strategies to stop the aliens’ attacks, and use a variety of weapons to defend your sheep. You’ll be able to use various weapons, such as machine guns, flamethrowers, and rocket launchers. You can also use a variety of different tower defense weapons, such as missile launchers, flamethrowers, and plasma guns. 

You will need to quickly think up strategies to stop the aliens’ attacks.