PVO - Air Defense

Air defense. Defense of a conditional base from enemy air attack.

THEY ARE COMMING !! FIRE!!!
Defend your base from enemy air attacks! You are alone against hordes of enemies. Show your skill and protect your people. The enemy is on its way, but you have a powerful cannon and a couple of boxes with cartridges. Show them who's in charge!
Crazy fun and a bullet storm inside!
Does not require an internet connection, does not require special permissions.