I played The Invincible as a sci-fi fan, although I've never read the original novel. The narrative was interesting, and the plot engaging, which is a great start for a walking simulator.
The art style was also sublime, being able to transmit to the player the retro sci-fi vibe of its time. The landscapes are pretty, but not fantastic, and the exploration is passable at best.
But, unfortunately, the gameplay in itself is insanely frustrating, to the point I almost turned on a walkthrough for the game halfway. Performance is shoddy, FOV is narrow, there's a stamina system, and, most notably, voices frequently get clipped. The last issue is the worst offender, since it makes the player artificially wait for dialog in what is already essentially a movie on wheels.
As always with sci-fi stories, the concept and ideas win me over, but while I found it interesting, it is definitely not without its drawbacks.