GR (Ghost Ranger199X) uses controls similar to Wolf Fire Games Reciever. Simplified so that combat is fast and fluid. The player controls the shotgun using 2 main buttons.
R = Insert a shell into the shotgun
E = Pump the shotgun
The pump mechanic works like shotguns do in real life however. So mindless mashing E will result in your shells dropping out of your gun in front of you.
Shooting a live shell will also result in it exploding. You can use this to your advantage though. As some types of ammunition are designed to do more damage if shot.
You can roll by pressing SPACE
Rolling also opens doors
Some areas require a torch.
Customizing your camo changes certain stats such as stamina regen and damage reduction. Weapons change your controls too.