One Bullet Left

  You are in a world like you have never seen before, with huge waves of enemies that try to kill you. You only have your trusty pistol and one single bullet, but this isn't any ordinary bullet, it's one that you can call back to you, and shoot it again. 

You can't last forever but let see how much you can take.

You shoot with left click and with right click you call the bullet back, enemies which you kill drop experience points with enough you can level up and upgrade your weapon.