To add some info about the score vs raw score. You need to have as many ratings as the game with the median number of ratings. As long as you have the median number of ratings, the number of ratings doesn't matter.
For those games that didn't receive the median number of ratings, this post explains it https://itch.io/t/644401/calculated-ratings-for-jams-vs-raw-scores
The formula for jam ratings is adjustment = sqrt(min(median, votes_received) / median)
The adjustment for game that got 19 votes in a jam with median of 20 is = 0.97467, about a 2.5% reduction in average score, eg. a 4.5 rating would go to 4.386 for the purpose of comparison during ranking.
For example, if you look at https://itch.io/jam/godot-wild-jam-71/results. At the top, it says the median number is 12 and (scroll down) Hotdogday only received 9 reviews, so it lost part of its score. Unfortunate, since it was a great game that would have won the Jam.