The game publisher Storybrewers has a new game, Castles in the Air, that looks very cool, alas it's not designed for solo.
You play as young people in the 1800s who share their dreams and have adventures. Then jump ahead in time and see how things break and/or come together.
The art direction is really great.
A solo game in a similar vein would be a lot of fun.
https://www.kickstarter.com/projects/storybrewers/castles-in-the-air-rpg
