Penguins From Space!

Defend the earth from waves of space penguins! Using your tank, accumulate a kill streak to unlock upgrades including speed boost, a shield beam, and an automated mini gun. Fight off different enemies and defend Earth as long as you can! -LEFT and RIGHT to move -SPACE to fire, -NUMBER KEYS to activate upgrades

-LEFT and RIGHT to moven-SPACE to fire,n-NUMBER KEYS to activate upgrades