The whole point of a game jam is to have fun, make new friends, and learn something new! It's not really all that much about winning. Even if you wanna win, doing that will make it unfair for other participants :/
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Yes, there are jams you want to grind, but for this one I chose to make a small highly polished game and have fun!
Regarding winning, it's hard to reason about "fairness" with certainty, because public vote is highly random - look at the public vote winners from Brackeys 2021.2:) I'd say exchanging 5-star ratings would be unfair, though