Don't be too hard on yourself is my advice, everyone always struggles with the time. Just know that in my experience, you don't have to have lots of levels, if the game is too long, people won't play it. So don't be afraid of not having enough levels.
My advice: Don’t stress out. Take breaks if you need to, and remember to put your well-being first. I hope you were able to finish and I can’t wait to see what you made.