Operation MachineGun is a fun Unity made shooter game that kind of reminds of the once very popular game Moorhuhn where you shot chickens. The difference is that in Operation MachineGun the enemies are not defenseless chickens, but soldier and tanks and missiles... basically things that can hurt you back.
This also adds another layer to the game, since this time, if you run out of ammo, you're dead. Overall it's a very fun game good for a few hours of fun.
Enjoy playing Operation MachineGun!