Chibi Soccer is a soccer Game I wrote in eight days for Xmas Hack 07:
http://xmashack.bafsoft.com/2007/welcomeThe download page for this game is:
http://monkeydev.com/chbscr/Here are the obligatory screen shots:
As you can see it is a game played by Big Head anime girls. The AI is as smart as a six year old. Run towards ball, kick it towards opponent's goal. The user can attempt to interject more intelligence by controlling a player from one team. Two player is available via game pad and keyboard.
The program is freeware/open source, but since it was hacked together in a short period of time that source is probably illegible to anyone but me. I am probably going to call this done unless the changes you suggest are very easy to implement.
I post this for your enjoyment and my ego. Also you should check out the other Xmas Hack entries this year. They are all free and some are pretty good.