I'm sorry, the official version being judged is the version submitted in the HTML format on itch, unless a technical issue prevented the game from being submitted at all. So I can't let you change your game files now. (But you could suggest to people, in the description of your itch page, that the downloadable version of the game is bug free)
As for players, we're hosting 2 days of gaming (https://itch.io/jam/gdevelop-big-game-jam-6/topic/4137158/2-days-of-gaming) and you can post your game on other sites(like Newgrounds) to try and get more players for your game.(And you can link back to your itch page on those sites, and ask those people to rate your game as well)