yes, you can update the game after judging ends, if you keep a way to play the original jam version. you just can’t update while it’s judging time.
one way to update a jam game after the jam is to give the original version and the jam version as downloads on the same game page. but this can make the list of downloads a bit messy because of 2 downloadable versions per platform, which is 8 downloadable files if the game supports 4 platforms.
this way has worked well for my Go Godot Jam (2021) game Tree Invaders beause the only after-jam update added the pause button to the web version, and any updates i might add later will also only be small accessibility updates that don’t change the game itself.
a better way for games that will have much more meaningful after-jam changes — like GreedySlime — is to keep the game page for the jam version and make a new game page for updates, because of these benefits:
differences in style and description between the jam game page and the after-jam game page get preserved
criticisms that have been voiced in the jam game page don’t get voiced in the after-jam game page if they have been fixed.
this also means that the after-jam version can more easily get a higher star rating than if the updates get applied to the jam game, since anyone never re-rates most games
the after-jam game appears once at the top of the Latest games page, after the jam game was already there
(this is the least important of these benefits because any game will not stay very long at the top of this page)
