i tried playing with 2 different ideas and made simple prototypes but ended up scraping both of them as i could not see them as highly engaging or having a fun gameplay experience, the theme is too difficult in terms of coming up with an idea
I thought up of a popular game that was similar and then decided to design it in my own way and figure out how to do this with free assets as I was a solo team.
Whenever theme voting starts, I take note of all the possible themes and take time ahead of the game jam to come up with ideas that I like for each one. And that definitely helped with this game jam! So I already had an idea of what I wanted to do beforehand
this is smart and then you have a bunch of ideas on hand, I know some people have projects started already with basics for jams that dont require everything from scratch.