I've done 15-20 jams. The early ones taught me the most, but each jam and project teaches you something.
In this jam, I learned that you can make one of the simplest games to play, but making it might still take ton of effort. We both spent 50-70 hours on this, more than any other week-long jam. Gameplay-wise, you just point and click stuff reactively, and the game only takes 2 minutes to play.
Our game: Bittermiff Family Dinner