I don't understand the comparison to the Matrix (or Dark City). This is not an Action film and was never meant to be. The closest thing to action in the film is a 15 second car ride ending in a minor crash with no fatalities. And in the entire film there are probably fewer than 10 bullets fired.
So why the continuos references to the Matrix? Mainly because of the nature of the world - or its reality? But again, there really is no similarity. The Matrix supposes we are all dreaming, unaware of the true nature of our existence. That is not the case in this movie. I find it incredibly interesting that someone in 1962 would come up with the plot presented here. (Or something like it, since I haven't read the book and do not know how close the movie followed the novel.)
SO . . . if you're looking for action, you won't find it here. If, however, you're looking for some interesting plot twists and a mystery that is slow to unwind and gives you something to think about, you just might like this little flick. The ending was a little lacking, but overall a decent B movie.