Spiters annihilation

In a far-distant planet lived spitersy. Spitersy it like creatures beztelnyh monsters. Spitersy lived quietly, happily ever after. But once on their planet invaded. People have decided to destroy all the alien creatures and attacked the planet Spitersov. You have to play for one of the fighters people and destroying monsters. Perform your duty, because in all the worlds and planets have no place monsters.