I'm not entirely convinced by the rating categories, let me share my opinions: 

"Overall" What does this mean? Isn't that the culmination of all other categories? How do you rate something overall? 
"Simplicity" Why rate games on simplicity, isn't it more impressive if they are complex and still made in an hour? Is more stars to simplicity good or bad ?

What about categories like, "Audio", "Visual", "Uniqueness", "Enjoyment", things I'd much rather rate these great games by.

In my opinion, the current categories do a disservice to many of the games uploaded.
Now that the jam is almost coming to an end this critique comes a bit too late, but maybe its helpful for the next edition!