Are we allowed to add screenshots to the game page after the submission window has ended?

Hi, yes you can add screenshots  :) 

After the jam, you are allowed to:

~ add screenshots / game banner artwork, edit the game's page theme, and edit the game's description on itch

~ fix game-breaking bugs (e.g if an entire level does not load, or something stops the game from being able to be completed) without changing anything else in the game

~ port the game to other platforms (e.g making a web build, or adding mobile controls) again without changing anything else in the game

Hope this helps and thanks for joining the jam!

Theo

thanks for the info