I've definitely found myself limited by what i've felt capable of working on. If you want you could have a look at the one I ended up doing?
My day 3 is here (Unity 2022.3.5f1) : https://itch.io/jam/day-3/rate/2191701 I believe everyone involved so far would class themselves a beginner. I only really picked up Unity in the past week, so have been following a lot of tutorials for the things I want to implement throughout the jam. Maybe this one would seem less intimidating to you?
Some general ideas now: If you create an AudioSource that is set to loop and play on start you could add some music to a game. You can also look up some other things, e.g. "How to add glow to your unity game", "How to animate in unity", or "Add a health bar in Unity". Another thing I've found is many games (at least the one's I've had) haven't had a restart button/function if the player fails, so that's something you could look to add in general (though I've added that to my projects now).