I don't personally have experience with scratch so I don't know what it's HTML export is like, but generally games that are exported to HTML/web get a lot more plays and traction than others!
Though others have added thoughts on scratch as an engine with some limitations, I think it's honestly fine for a two week jam, especially if you're learning how to code. Getting more experience in small or limited engines is a good way to approach game dev without becoming overwhelmed as well as gain confidence, and when you feel comfortable you can transition to others. Just my two cents having run this jam a while: I don't think there's anything wrong with beginner engines/languages or node based type scripting when it makes coding more accessible to a wider range of people who might find other engines too intimidating to really finish out games.