You are the world’s last hope to try and fend off the aliens. There are tons of different units and upgrades that are available for you to defend your base as best you can. There are barriers, guns and turrets that you can purchase. You can also spend the money on upgrades for the units you have bought as well. Don’t lose all your health or it is game over! The great part of this defense game is that you will be shooting the gun yourself so you are much more involved in the process. Try it out – this is a great new twist on the defense genre.