Beware Planet Earth

is a beguiling mix of classic tower defense and time management coming to PC via Steam for the first time. Beware Planet Earth. Save your cows from the Martian invasion by building an effective defense using towers, traps and objects, and also by firing your Zapper directly at the invading force of little green men. Features Exclusive content on Steam: a multitude of new levels and enemies inspired by Valve's universe. Endless Fun: full story mode with 46 levels over 4 seasons, plus 28 bonus.
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