I did not really enjoy this on its own, but I can see groundwork building up a to a great full version. (mild spoilers)
The graphics are good. The VN parts show emotion in the classic manga way, but don't go over the top. I like that.
Billing this as a puzzle is a bit of a stretch. The items gathering part was close to a puzzle, but didn't give you much information, so it didn't even feel like a problem-solving exercise. It felt like "interact with all the things and then move on."
I enjoyed the beginning of the part where it brought up what Kat's disappearance would mean for others, but there was no bite to the insult because (regardless of the canon), it didn't feel to me that Kat got herself into this situation. I would rework this part to include Kat hurting/insulting her [spoiler], and didn't get to apologize for. Bonus if she finds out that part of the ritual caused the hurt in the first place. Then you can add introspection later where Kat realizes what she should have done differently, and grows out of her immature mischievousness.
Rating of this short version is 4/10, but if this game gets a full version, I expect I'd give it 6/10.