Use your mouse to aim Space to shoot W to change to Your Basic Cannon (Default) A to change to your Rocket Launcher S to change to your Mortar Shoot out your enemies and don't let them hit your base!
After upgrading my zombie hoard game, I became obsessed with having your mouse cursor as the aiming tool. So I just incorporated this into my Base Defense Game and here it is! Bragging Rights update! Now you can see how many waves you survived! Everything is of course random other than the flight of the projectiles, the amount of points and your beginning base strength.