All purchases add more.
Your mission in this futuristic advanced tower defense game is to stop hundreds of incoming enemies before they reach your main base. To start the mission you have to buy Tryclone which will give access to the first defensive work. Later you can purchase new buildings which will open access to more powerful weapons. In the battle use the menu on your right to purchase new defenses.
Use YOUR MOUSE to select, place, upgrade and repair your units. Good luck!