what are your opinions on making a game on scratch, the converting it to HTML, then posting it to the jam?

Let me know!

It’s fine for making a small game, but I recommend using a better tool to develop games. Other game engines often have better structure and are also more flexible than Scratch. Reusing code and debugging is also easier with most tools than Scratch. Not to mention other game engines don’t have the limits Scratch has. (Like the clone limit) There is also performance to consider. Scratch isn’t the best at that. But again, if your game is small and if you don’t plan on developing it further, then Scratch will do.

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.