Following up on the last comment, not only is the audio stolen, but much of the graphics as well.
Find an artist or make your own art but god stop stealing other people's work, it's blantant plaguerism.
Really needs a quality setting. Options settings would be optimal, control sound, music, and other basics that wouldn't effect the game too much. My machine starts to crawl around the tenth wave or so when grenades and explosions start popping everywhere.
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 "Mud and Blood 2"){kind=icon}