I've been basically solo for all 12 of my 13 jams so far. This one has a 30 day timeframe so I'll be able to scope out pretty big as I have a lot of time on my hands. Here's my last solo 30 day project for a previous jam. I'm pretty hyped about this theme, I will probably do a three JS 3d Platformer (HTML, with Three JS) but not totally sure.
https://itch.io/jam/alchemy-jam-7/rate/4154591