Granny Pills: Defend Cactuses

2075 year. Following the invasion of extraterrestrials, there was nearly no existence and oxygen remaining on Earth. The sole vegetation that endured are cacti. The aliens aim to annihilate or seize all the cactuses to halt life on Earth. The courageous Granny, who cultivates her cactuses by the roadside (to ensure they can absorb sunlight), must safeguard them from the aliens. She uncovered that the extraterrestrials have a fear of human medication, and she possesses a substantial supply of it, along with a shotgun ready for emergencies. Assist her and her cactuses in reviving life on Earth and driving away the aliens!
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