So the company doing it is Troyca, so more knowledgeable people than me, is that a good or bad sign?
They did few shows, but all of them have good production value. Sakurako's Bones, Aldnoah Zero, Re:Creators.
I guess regardless of the budget they're getting, they'll probably try to keep their portfolio good. They also don't get a lot of projects, so they can put effort on this one.
Should we be worried that the script writer for Hibike is writing this script too...?
It's the opposite. He was probably one of the reason why Hibike is gayer than it was supposed to be. He did shows like Love Live, Chuu2 and recently YoriMoi. Most of his shows have some yuri subtext in it, so he probably likes to add it.
He's also an actual good writer, so she should make a good job adapting it.