The alien invasion is rapidly getting closer to earth. your mission is to protect our planet by eradicating all invaders. of course, they will not let you achieve your goal. you will have to use your weapons to defeat them. you will fight increasingly fierce battles as you encounter more and more powerful individuals. in particular, there will be a battle against a ruthless boss at the end of each map. stay on your toes to survive and gain experience to unlock new weapons. have fun!
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