Insist that passing goals require three players. Once a goal is scored, immediately attack going in the other direction. Only the attacking team can enter this area. This is a possession game that uses the keepers. Instead of trying to score, each team tries to pass the ball from one keeper to another.
Keepers can play the ball with their hands.
Always look to get the ball forward and to the keeper. Counter attack often. Since the flow of play changes quickly, players get practice in the back and front. Quickly get behind the ball when possession is lost. Prohibit counter attacks.