kill cancer cells

FREE! FREE! FREE A large number of alien cancer cells attack the Earth, and you need to control the aircraft to destroy all kinds of giant cancer cells. After the cancer cells is destroyed, it will split into small viruses. After the virus is eliminated, it will split into smaller ones, and the difficulty will be simple to difficult. But mainly reflected in the blood volume and quantity of the virus. Every 5 is closed with a boss cancer cell off.