I enjoyed the radiator scenes, it has a meaning.
And again, quite subjective. My dad found the Lady to be God and her squashing the sperm to be "clearing him of his sins", and he's dead and in heaven in the end. Others find the Man in the Planet to be God and the Lady to be death. I saw the Lady to be the manifestation of all of Henry's fantasies, both sexual fantasies and fantasies of another life, and the end is Henry gone completely insane and "embracing" the fantasy world in his head.
The Tagline for the film was "A dream of dark and troubling things". I think that's the other reason I really loved the end. It felt like the suddenness of waking up from a dream.
Also, who else was completely freaked out of the bull moving around the room at the end? Ooosh....nightmarish that was.