Doomsday defense

Judgement day has come, the earth was filled with bloodthirsty zombies and monsters, they destroy everything in the way and stop them can only brave like you. You took a comfortable position, and should provide an important defense facility where the hides remaining small group of living people. Shoot the moving monsters, not allowing the beasts reach the goal. Use convenient weapon, you have a vast arsenal, but it is not available immediately, but as the destruction of the enemy.