Traffic alone is not representative stat, since various games have various sizes. I can use site's visitors log for it (for example "Monster Girl Quest" download page was visited 17,606 times this month so far, where SonoHanabira 4 one got only 1,262), but it's not a measure either - short,unpopular, but controversial game can have much more discussion, than some random nukige that was downloaded thousands of times.