A free app for Android, by HandyGames.

Farm Invasion USA is a free action-packed 3D shooting game for Android mobiles and tablets. It’s a real-time strategy (RTS) game with a unique twist – you control the entire battlefield! You can use a variety of different weapons, such as machine guns, rocket launchers, grenade launchers, and even a super-heavy cannon. You’ll need to take out the alien monsters and use your weapons to protect the innocent people from harm’s way.

You can also play with other people online in real-time, or with your friends on the same device. You can even team up with them and take on the most powerful monsters together.