There are two things to keep in mind with regard to the feedback issue:
1) To have feedback you have to make sure you share a significant portion of your game. I shared quite a bit but I am not talking that much but more then two or three sentences. I know it can be tough designing AND remembering to share on the thread and some people like to keep their recipe under wraps on purpose. I myself just made posting here part of the process of game design.
2) It is going to be difficult to qualify commentary as opposed to quantifying it. I can make 70 comments which sound like absolute crap or I can make 3 useful comments. How do we judge that?
One suggestion I might make is do something called the Commercial Break where you get extra points if you can write a decent summary on at least 3 different games, before the end of the Contest. I know, not everyone has the time. Any judgement of commentary, IMHO should be positive only. You do not lose points for not commenting but you can gain them by doing so intelligently.
Sean