While there is a central fantasy element with the presence of witches and magic, those simply add complexity to the efforts of residents of a small town to solve a murder (or prove that it wasn't one), rather than being an end unto themselves.
The magical hand movements seem to have come straight out of The Magicians, but work in this series as well. Nothing about the fantasy element is particularly innovative, except perhaps combining it with a crime genre and setting it in a community where witches can live openly among their non-witch neighbors.
The acting is good and the script gets the job done without being unduly annoying. The teenage drama is fortunately kept to a minimum, and focused only on the central plot points thus far. Some misogynists may be upset about the plethora of strong female leads, but there's more than enough relevant guys in the story to satisfy a reverse-Bechdel test.
It's an easy and enjoyable watch.