PKD only saw a 20-minute effects reel set to some pre-existing Vangelis music that they liked, not any assembled scenes. He was amazed by it, but it's worth pointing out that he did not like the script, and disagreed with most of the changes.

Blade Runner is the rare adaptation that is pretty faithful to the essence of the original material (which is what you'd hope for), although by making Deckard a replicant it changes the point of the novel, which is to show a man's disillusionment with a world that has become itself an illusion, a fake reality that lacks meaning. The androids in DADOES are sociopaths who can't feel anything, whereas the film portrays them as full of empathy and deserving of love. The film turns it into a story about a hunter who learns how he's wrong to hunt brings that can feel as much as he does, which is an altogether different and rather more mundane concept than what the novel strives to tell us.

Do you have a reference to his comments on the other changes? I would be most interested in reading them.

Personally, I feel analyzing PKDs books as if they were written with a clear point in mind doesn't work well. PKD, was a heavy drug user (in fact he's quoted as saying all his books were written while on amphetamines). He claimed to have paranormal experiences. And claimed to have had a parallel life where he lived as "Thomas", a Christian persecuted by Romans in the first century AD. I think he was heavy interested in Christian mysticism.

It's his questioning of reality, and his visions of other worlds, and the idea of a shifting, unstable reality that come across in his work for me. I think Blade Runner the film, is an interesting take on this. It's certainly a very vivid vision of a different, confusing and mysterious world, and it's my guess that this is what he liked in what he saw.

I also also surprised to hear he liked it, given how different a world it is to what he wrote.