In 2 Player Mode, P1 uses WASD and P2 uses the arrow keys. In CPU Mode, you can use either set of controls. Hit the ball into the opponent's goal to score a point. First to 5 wins! (Get the ball into the goal OPPOSITE of where you start. :P) The physics aren't perfect but I made them the best I could! :) I think they're alright.
About the computer player, it turned out a lot better than I was expecting. It's not hard to be beaten by it. The best way to win is to keep the ball away from it as best you can and make sure not to hit the ball so hard that it ends up in the other goal! xP Okay, so here's a challenge: Beat the CPU in turbo mode. O_o It doesn't seem to be affected by the speed at all. Game idea from @furminator2 and inspired somewhat by the game Soccer Physics. Have fun!