Last time I participated in a Game Jam, I fell victim to what I call "lethal averageness of reviews". By that I mean, I was encouraging as many people as possible to rate our game, and that ended up being our downfall.
How ? Well, all we needed were 10 / 20 ratings. We ended up with 100+. What happened was that with this many ratings, it statistically made it so that the raters who marked generously or severely cancelled eachother out, and we had a probably more objective average score, sure, but it usually meant a lower score too.
And guess what ? That time the jam was won by a game which only had received barely over the minimum amount of ratings to qualify. It was a pretty good entry but you could see luck was involved too, because out of the few reviews it got, most seemed generous.
I saw that here, we also only need 20 ratings to qualify for ranking. How does it work beyond that ? Does it use the same system ? Because of it does, I will stop trying to show my game around right after I reach 20 - 25 ratings and cross my fingers !
For those curious, that previous Jam was a while ago : Ludum Dare 39.