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most of the games are low on rates, I think the trick is to make the "thumbnail" appealing

or use tags, cuz the "ice slider" submission has the most rates and it has 4 tags

thumbnail and tags are mainly needed for general search. I think they are not needed for 13 games. Maybe the participants of the jam do not know that you need to evaluate each other's games?

probably. there's 14 entries and the highest number of rates in a submission was 5.