This is a really fun idea and I'm glad for more variety of this kind of spooky book to provide to tweens! I think the "Stranger Things meets Coco" is a pretty good comp and I know there are tons of young readers who will be eager for that.

That said for me as an adult reader, I think I just often struggle with middle grade books for being a bit silly and simplistic? Which is like...how they should be for their target audience, which is not me.