I liked this. There were just a couple of screens that swapped out the R key for another which broke the consistency of always using R to return. I guess using arrow keys to navigate the options (instead of pecking at changing keys) may make it more accessible too?
The music fit for me, but I wonder if the different sections could trigger a nice subtle music crossfade to fit the new setting and help to paint a better picture of progress in your imagination.
Nice work! I was hooked to find out how it ended. :)