Just finished the demo, took about an hour-ish for me.
I really liked it! The characters are fun. I think the opening gives enough story, and the opening scene with Helmer being tsundere and locking himself away is cute. I also like MCs personality, a little sassy and assertive is great for otome.
I did find the chases a little repetitive after a certain point, especially because I didn't find a savepoint inside the castle. It was also a bit confusing at first, because by chance the first three times I tried to enter the statue-room the chase restarted, so I was unaware of the door with the password and was just wandering aimlessly. Then when I got the papers I didn't know how to combine the items. Would be nice if after gathering everything necessary it happened by itself or had a little notif.
Overall the vibe is great though, unlike the other commenter I think the visuals are great for the type of rpg-horror game you're going for! The characters and maps are very beautiful and I think the otome fans who also like horror rpg will love this. I look forward to the full game!