To play We Want War you need to have keyboard and mouse. The mouse is used for aiming and shooting. The keyboard for moving and grenades. There are two control methods to choose from. The keys are the same in both methods. Try both of them and choose your favorite.
The slow motion feature means that the player has ability to slow down the time for a while. While in Slow Motion mode, everything except your guns are slower. This gives a huge advantage to you.