In Star Defender 4 you have to blast through more than 100 levels, 8 unique missions and huge impressive Bosses. Face tons of new enemies with a unique style of behavior and new ways of attacking. Prevent the destruction of humanity in this epic full action packed shooter game with 8 Large missions with a huge boss at the end of each space battle, new unique weapons, over 100 unique levels of shooting fun and a wide array of alien spacecrafts.