Many struggle to fit all their ideas into a 10-or-15-minute window. That's the vibe I got from Goodnight, Halloween; they're trying to fit a full movie into a quarter of the time. There's clearly a whole dystopian fantasy world the filmmakers wanted to explore, but couldn't due to time restrictions.
This leads to a heavy emphasis on world building, to the detriment of its other aspects. The characters and plot aren't as fleshed out as they could be, leaving this story flashy, but shallow. That's unfortunate, because the lack of interesting characters, and good flow, are exactly what keep a viewer from being interested in the world you're trying to build.
All in all, I do like where they were going with the story, but I think this one needed a little more time in the over to balance it out. I'd still call Goodnight, Halloween a Good though, so check it out.