The listing, Rocketbirds: Hardboiled Chicken [Steam Key] has ended.
Annihilate an evil penguin regime in this cinematic platform adventure game offering full solo and co-op campaigns.
Set out on a mission to assassinate the totalitarian penguin leader as Hardboiled Chicken. Destroy enemies with a slew of weapons and illuminate the secrets to his past while uncovering the real enemies of Albatropolis. Master fowl play in the co-op campaign as a pair of Budgie commandos on a mission to save the general's daughter. Many lives will be destroyed, countless penguins will die!
More info: http://store.steampowered.com/app/215510/
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This game works on mac and linux too!
Good Luck!