Gunner: Free Space Defender

Gunner: Free Space Defender is the first-person war 3D space shooter. Good old motto "Shoot 'em all" is probably the best way to precisely describe the game's purpose. You are the gunner controlling a space turret and your objective is to shoot, shoot and shoot some more to protect friendly objects and destroy all attacking enemies.
As a Gunner you have 12 types of Primary weapons and 6 types of Secondary weapons for your space turret that will help you to do the job. Bullets for Primary weapons are unlimited, but each shot will cost you a score point. Secondary weapons are limited in ammo, so shoot it sanely.
There are two game modes in the game: CAMPAIGN, where you choose your weapon and are not limited in time and SURVIVE, where with a certain type of weapon you have to complete the mission in a limited time. Each of them includes 32 missions with 4 types of difficulty, which will not leave you indifferent and will not let you get bored in this shooting game.