Your site looks quite fine. I can give you some suggestions to improve it. You can add a slider on homepage which show new and popular games. You need to use a better color scheme.
I dont like it, Its too box'y, the color scheme is a bit off and the category (number) bit at the top takes up too much space. That said, you could improve it wit a bit of border-radius, a better color scheme, a menu item/system that removes that category (number) block from the top, and definitely a better logo. Besides that, the actual backend of the site looks and feels good (dont know if its a purchased script or if you made it yourself) but it seems to do what its supposed to where its supposed to, and you dont get that very often. Kudos At the moment, i'd give it a 4/10 for design, and 7/10 for script. Cheers, Coder