Really sorry your game didn't work out. It's understandable though, game jams are really stressful. Making a game is especially hard by yourself, I usually get my whole friend group to help me out. Even with there help I have done 10 game jams and only submitted 2! But don't beat yourself up over it. Because game jamming is a skill and like with any skill you need lots of practice.
But keep trying, you will get there :)
If you want more practice the mini-jam is hosted twice a month.
That's how I started getting good.
Here is the link: https://itch.io/jam/mini-jam-88-rush