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A very enjoyable defender game but I have one problem, a glitch rather. The laser has infinite ammo. Now you need ammo in it to do the glitch but basically if you just keep it held even after it runs out, while it doesn't make the sound the laser still fires and does considerable damage to the enemy.
I finished the final level by simply holding the laser and it blew the hell out of everything, stealth soldiers, heavy units, bikes, regular infantry. None of them stood a chance because of this glitch. It's something I'd try and fix.