From the author's note: "I wonder if MadoHomu will get a happy end [in the movie]....!?"
[Possible Spoilers ahead]
I couldn't remember when Rebellion came out so I was like, "How does this fit in with the story with Kyubey being around? Is Homura creating this fake world and is Kyubey trying to sneak into it and destroy it?"
When I read that author note and found out that this came out before Rebellion, I actually said, "Oh my god!" out loud.
This was an adorable doujin but some of the fanservicey parts were annoying given their age. I know the author tried their best to make it appropriate, but did we really need the closeups of Madoka rubbing sunscreen on Homura?