To Protect the Earth from alien invasion, you're given a ship class AT-021. But unfortunately the Earth doesn't have enough resources to supply new arms to the ship. Improve the ship by collecting weapons through battles and buy turrets to defend.
The EF: Warfare sequel returns with all TD elements. Build any tower from any group but after you build the first one, that group will become Primary. Secondary will cost 120% and so on..
A never-ending series of battles against stronger and stronger enemies. Raise your stats, learn new abilities, buy items in order to outlast them. Build your hero and defeat as many enemies as you can.