Creepy music, good gun soundeffect. I wish I had a map to see where I was going, started running around just looking for batteries and ammo. None of my enemies wanted to die.
No, you only get an ending by eliminating everyone.
If the crosshair isn't red, a close-range shot shouldn't do any damage. The shot is fired slightly in front of the player, so as not to collide with his own collider. I made this system too simple