I've managed a number of affiliate programs over the years, and I've never found a CPS network that's easier to work with than Shareasale. They make it incredibly easy to access detailed information about every referred order, and they have a lot of cool features that make your life easier as an affiliate manager. The "Create a Custom Link to a Page" feature saves a ridiculous amount of time because you can just tell affiliates to make their own links. I know Linkshare has something similar to this with some programs, but Shareasale makes it way simpler. Shareasale also lets you upload videos that your affiliates can use (affiliate link embedded), so if you have videos of your games, that might be something you want to think about.
Disclaimer - I haven't used Linkshare as a merchant in quite a while, so it's possible they've added in a lot of the stuff I like about Shareasale. However, I still think Shareasale has the most convenient interface and best customer service of the 3 big networks. It's also considerably cheaper than the other 2, though you're not given quite as much recruitment help unless you want to buy extras like category/holiday sponsorships.
