I would like to push out an update which gets my game closer to being complete, but I want to honor the game jam rules and not screw peolpe over in the voting department. How does that work on itch?
For the duration of the jam's voting period you should keep the original jam-version of the game available for download on your itch page. If you want to upload an updated version you should make it clear which is which -- for example, name the new version "postjam version" and the old "jam version". If I remember correctly: uploading a file with an identical name to the old one will replace it, so be sure to name the file you upload something different.