Use arrows or A, D to move and your mouse to drag enemies. All of the monsters are carrying pieces of candy. In order to take their candy you have to eliminate them. If you´re lucky some of the monsters will drop health-potions to increase your health. Bats are too quick to grab with your gravity gun, so you´ve got to throw something at them to make them fall to the ground. The best wayof dealing with a devil is by lifting it up and throwing it straight at another enemy or to the ground. Zombies are too strong to get affected by things thrown at them. You need to pull off it´s head.