Predicting what was coming next took me out of it at first, and I didn't really feel deep under at all by the first "am I hypnotized right now?" I was kind of confused by trying to feel a separate part of me, and thinking about why I might want to be hypnotized also distracted me a bit... but at some point, I was definitely under.
While under, I didn't really feel overwhelmed at all. Just kind of blank. Having an empty text box was a clever touch, I think that's where it felt the most blank.