Substitute

It’s a tower defense game where the bad guys are animals that have been mutated in World War II experiments! Use the money you have at the beginning of this game wisely, because once the mutants start attacking, they don’t stop! Use your mouse to move your last line of defense – your cannon at the bottom of the screen. This weapon has limited range but if anything gets by your turrets you’ll be glad you have it! As you progress you can purchase upgrade to combat the increasingly difficult waves of mutants.