It depends on how far you want to go. If you are going to make a couple of games, feel free to give each one its own page. However, if you are aiming to make a bunch (like 5 or more), then I'd definitely spend a couple of minutes on either a shared launcher or at least a shared page. This is our general advice for the challenge as a whole - one anthology makes it easier for people to see everything you did in one place. Think of it like a home page :)
For the game jam specifically - if you somehow get multiple games done then a single build is recommended, as you can only put up a single entry.
However my advice is if you feel you can get multiple items of the challenge list done in the time then I would aim upwards to a higher difficulty item.
