I think u shoul add some PvP games so that u can actually play the games with other players. There are actually games on the site that would be alot more fun against real people and not just against cpu's all the time.
Its only hard if u make all these massive MMO's. If u just have some simple PvP flash games like pawn or even some of the games on this site that could be converted to PvP, its not all that hard.