found some expenation by googling :)
https://itch.io/t/527869/karma-system-for-the-game-jams
Quote:
every entry has a "coolness" value that increases as the player rates and comments on other's entries, then in the listing of the entries there will be a filter called "Smart Balance", which lists the games based on two things: Their coolness - amount of rates/feedback that they received. This system kinds of "Guarantee" you to receive more or less the same amount of feedback and rating that you've given