Dude, about the bad ending, I don't know if it can be considered a bad ending, after all, it leaves a lot of room for the future, like her working in New York or something like that using the Eagle Miraculous, because it wasn't mentioned in this story, but that doesn't mean it didn't exist. It would be cool if you made a spin-off with this ending.
If you don't, that's okay, because I'm looking forward to your Ben 10 story.