Looks good, I love those games. I think maybe adding more text would be a good idea, there is a lot of pictures.
Yeah, you could better use the sides by adding more content instead of having all that white space. Looks good though.
I'd suggest to get a customized header/logo. Also, link the game images to the actual games, since that's what most users tend to click to play the games. I'd also recommend to get a proper domain name and add more games/content. Good luck!