I think I could participate in this contest, but the only thing I wish, is that you would give the participaters more time to finish their level. Two weeks isn't enough, if people want to make a bit larger level than a level which can take a little more time, especially if they have a lot of other things to do, and they can't spend time on the level that much per day.
So I wish that the deadline would be 31th october, so a whole month at least. And then, at Halloween, you could organize the day of judgement. I have also a lot of other stuff to do at the moment, and the next level I'm going to finish is going to be quite large one. So, it will take much time from me to finish it.