Now this is a very interesting game concept! It is way too complicated for me to learn, but I do believe that once you master this it becomes more fun :)
I would suggest to pack all the techniques in one single tutorial, it's just less confusing and won't take as long as going back and forth.
But besides that, I like the story and also the different ways to kill the enemies, like in the head, throat and chest etc. , even thouhg I wasn't able to pull that off :)
So yeah, basically, great game, but a bit too complicated in my opinion. Would definitely like to see more from you ;3