Very solid demo. My main feedback is that the camera when not locked on is waaay too low. Souls games usually keep your character's head exactly at the center of the screen. But here it seems like the center of the screen is more or less her bellybutton? IDK, but it's too low and uncomfortable to use. It works well when locked on though.
And also I haven't really found a reliable way to recover my posture? Sekiro let's you hold down L1 and stand still to recover it over time