I like the keywords, but not the extension
I have plenty of strong keywords with .cc ext.
I try to develop them all. Really not easy to sell, frankly speaking.
Good Luck.
My .cc's do really well at Sedo as far as pulling in traffic (the type-in kind) and revenue.
"online game" is one of the best keywords you can have. The fact that you don't have the plural... doesn't mean a damn thing! IMHO
This set of keywords is outstanding and has great potential not only for development, but for parking revenue.
My advice would be to test this one out at Sedo for a minimum of 6 months to really gauge the potential. Some keyword rich domains don't start showing their true colors for a few months... base on my expierence.