Really good, but I hate that most of the game is in real time. It feels like I being punished for reading,thinking or gooning. Time also passes while you are in inventory, atleast change that.
You could add some notification that explains that you have to summon your familiar from your character menu to use it. I did not notice it right away.
Also it looks like we will have more familiars in the full game. How is that going to work considering spirits are really hierarchical in the story, and won't join you if there are stronger spirits who want to? Considering Lumi? (the starting familiar) sounded strong, and I would be supprised if she leaves us.