Aliens attacking again. This time, however, is hope and you just shoot the mother ship of our orbit. For manufacture of such weapons laboratory is here that you must protect, otherwise it is with humanity Amen. The classic defensive play, which, while not building, no defensive towers (except one), but outside of your struggle you build the buildings to access improvements and particularly the possibility of buying new weapons, which are crucial in this conflict. For each round you get some points for investment and if you accidentally make a mistake and clearly fail the next day, then you can easily repeat the whole situation again. At the end a little boring, but otherwise succesfull game.