I'm on the same boat as well.
I've gotten down on a simple idea, followed many different tutorials on YouTube and ended up with big mess on my Unity Hub. Still working on the melee attack of my character and I only have a single plane as a level.
I want to say that this week has been a giant learning experience for me. It takes a lot of effort to complete a game and I must appreciate all those who worked really hard in this Game Jam.
If there will be another CGJ in future, I will keep practicing in making games and seek out any teams that can offer help.
Like many other would say, this is just for fun and it's best to look at the bright side of things.