This was my first game jam that I had participated in. I heard of stories of people not being able to get their work oit on time, by being too ambitous or something like that. So I decided to go with something simple. I also happened to be on holidays the weekend of the jam, which meant having less time to make the game. This meant I was going out on walks and stuff for a few hours each day. In total, I think I spent about 12 hours in total on the game. This didn't end up being a detrament towards the game however. Being outside and being active allowed me to clear my head, get more ideas, and when I went back to making, I was super productive.
So maybe we dont need to spend all the time of a jam making the game, but instead keeping ourselves healthy during the jam to make ourselves more productive. I dont know. It worked for me, although my game is quite simple. Im still proud of it.