I think this needs tidying up:
Although Alex is human, and possesses free will, he cannot in fact make any decisions on his own. He is being used like a machine by the government, to do whatever they desire with him.
In the first part of both book and film, he has free wil, but the government treatment removes his ability to exerise his free will- he still wants to do bad things, but the pain and nausea stop him. I think that you should ualify your statement about the governemnt to make it clear when they control him: otherwise, it sounds as if you mean throughout the book.
You could also bring out some of the other differences that are most likely the result of the transfer to the cinema- the glamourising of things, like his home, the increase in age of the two girls he has sex with.
Also, does your edition of the book have the last chapter describing his life after the hosptial? It's a rather sickly ending, and the edition eending in the hospital is much more menacing and better.
BTW, congratulations on the other piece.