I did sleep a "healthy" 5h per night during the jam. However, I did quite a few tricks to simplify the assets. The only real labor was on the main character, for which I made a ton of sprites. The rest were super simple with 2 sprites for the monsters and a basic tileset for the environment. Music was also very short with 5 or 6 notes in total and a lot of repetition. Most of the time was just coding the interactions and making the levels.