The promo art is just so dull and unappealing. This doesn't look like anything special because nothing special, exciting, let-alone noteworthy is going on in this promo art. Promo art is supposed to get the attended audience pumped and excited for its release by showing a sneak-peek of something that's bound to be trailer-worthy. Two witches (oh wait, Rosemary's not a witch lel) flying down an empty strip mall leaving behind who're supposed to be their BFF comrades whose running styles are just as plain as they are is not exciting no matter how you slice it.
"Steven Universe meets Little Witch Academia" (of which now HGS is way more behind the times ever since the SU movie aired) is a terrible pitch and that alone isn't enough to get a show green-lit. And here's the thing, you can do a slice-of-life magical girl show, but it needs to provide something new or fresh or different from the rest of its competition to attract an audience. And HGS hasn't provided any of that. It's too generic and safe even for its intended target audience.
I also still don't believe the blonde's a dwarf. The Powerpuff Girls reboot has a better grasp on perspective and size than all the artists who worked on this combined.