Don't worry about topic overlap, an earlier thread can be a fun way to see how everyone's plans look before development starts!
A gamebook style adventure sounds fun! It's a very good format for a jam game, the core structure is easy enough to assemble, and there's lots of room to make ambitious branches, make cool art, or add other complexity. It's also a bit easier to wrap up if the deadline's getting too close.
I often get too caught up in the code and mechanics when I make my own games, so while they end up feeling complex they're not always offering great experience in the jam releases. I'm really hoping to make something a bit more fun and approachable this year, but as my first game set in a large and randomized 3D environment, there will definitely be plenty of big structural challenges to overcome. I may just need to save some of the core mechanics like spells, shops, or quests for later expansions.