You started off with some information on how the story came about and the history of the story. I don't really care about the story's history - just get to the story. I would get to the story and after I hear it I would be more interested in where it came from. I enjoyed the first story with the comet. The Joe Frasier story was a bit slow for me. I was somewhat confused as to why I was listening to multiple stories. You might put that at the beginning of the show, "We have three stories today with the theme second chances." While this story had me wondering if Joe was going to pass his test, I wasn't willing to sit through all of Joe's classes to see if he makes it or not.
My thoughts behind a "short story" is I expected the podcast to be about 10 minutes in total, so when I looked up and saw the file was 20, I didn't want to sit in every one of Joe's class with him. Keep in mind, I'm not a huge fan of fiction unless it really comes and grabs me and gives me some stakes, or reasons to love the character. For me, it just didn't hold my attention. If I was a smaller child (say age 10) I might have lasted longer.