Colonists have colonised a planet and built a Silo to store their grain.
However, Monsters on the planet are constantly attacking the Silo to get to the grain. Your Job is to Intercept the Monsters, if a Monster gets past your Interceptor while a Silo wall exists, a section of Wall is removed exposing the Silo for further attacks and your Interceptor can only drop Bombs while in Launching mode. If a Monster is destroyed, your Interceptor may or maynot remain Stationary or in Launch mode.