FYI the word "Droid" is the copyright of Mr.George Lucas, so if you were going to use it in a game you could easily be in trouble. Id call it BOT soccer or some other name.
Quote:
George Lucas holds a trademark on the term "droid". The miniature mecha combat wargame BattleTech was originally released under the name BattleDroids, but was renamed due to trademark issues with Lucasfilm.
http://en.wikipedia.org/wiki/Droid
**The only reason I know this is because I was thinking of using the name in one of my projects.
The game looks really cool though, good luck with it.