I like it! Like others said the induction could use some tweaking -- perhaps adding some lines while you play would be valuable as well, since I find the focus of playing a repetitive game to be a good backdrop to hypnotize someone to.
A minor tweak that I feel would be quite good would be to have lines clear one at a time, so if you clear four lines at once the sound plays four times, clearing one line at a time. Perhaps it's just that pleasure triggers aren't that strong with me, but I found it most enjoyable when I managed to clear multiple lines in a row and I can't help but feel clearing multiple lines should be more rewarding than just one.
Overall, a solid hypno-game. Probably going to recommend it to a couple of my friends.