Having the players keep score makes this even more competitive. This drill was another taught to me by Charlie Zarzour of Huntsville, Alabama at a USSF Coaching clinic. Defender starts on the hip of the attacker who is parallel to the goal at the 18 yard line with the ball. The object to make just enough space to get the shot off. The top progression would of course be 1 v 1 with Keeper to beat and for Premier player 1 v 2 with keeper.
Any questions feel free to ask.
I have all the answers. Everyone in the circle has 2 balls and the goalies take turns in front of goal. On my shout or whistle, each player shoots, one at a time, moving around the circle. When you get around to the other side, keep going back around the circle to the player you started with. Generally, as soon as the goalie touches the ball or it's clear the ball will go behind the goalie, I call for the next shot, so they come very quickly.