I couldn't find any info on that for that jam, neither on the itch page nor on their site's rule page. The standard for most jams is: You either need to make a web export or export for all desktop platforms (Windows, Mac, Linux). Some jams allow only windows, some require both web and desktop. It varies. As a rule of thumb you need web and windows for the bare minimum. But remeber of how the players will play your game, you don't want to restrict anyone who doesn't run windows, etc.
We should probably need jam hosts to clarify on that detail, as it's actually not specified anywhere which is surprising
