Hey there,
to clarify this a bit. Of course you are more than welcome to share your work after the jam. Normally within itch jams your work should be don exclusively for the corresponding jam with only work done in the timeframe of the jam. For this jam you’re open to use content from other jams you might work on that are running parallel to this time frame (maybe started a bis earlyer that this jam but is finishing withing the timeframe of this jam or after this jam has ended). So for example you joined another music jam in the same time frame you are open to also use the music or artwork for this jam too. Hope that clarifies it a bit