3rd Invasion - Zombies vs. Steel

Now Poly Units move in the chosen direction. (It worked before, only if you selected tanks and then light units.) Now it works both way. Same type Units (within range) Activation with Middle Mouse works, also for Artillery units. Add sounds when You get money from external Areas, every 60 sec. Make the wall stronger. Added Enemies towers becomes invisible, if out of range. Tutorial will come in the weekend. (IRL Work pays for the GameDev hobby.)