Pony Per Book, Fifth Instalment

As the fourth instalment of Pony Per Book is being released, I have acquired another story for the fifth instalment. There will be no spoilers in here about the next coming stories, just an update.
However, I want people to tell me how it's going, for those who have read any of the stories. Is it off to a good start? Should I rewrite some stories? Anything would be helpful in understanding where my writing is at and how my audience thinking what should and should not occur.

-Mr.User