The audiobook of Mark Twain’s Life on the Mississippi provides, in its first half, a near-perfect template for a business tycoon / colonisation / steamboat piloting videogame. Admittedly, in the PC Windows market anything that comes within a league of being a sailing/pirates game falls overboard and gets eaten by sharks. And I guess the pre Civil War setting (1800-1860) could also be off-putting for many distributors. But I’d like to suggest that the book could also be easily translated into space sci-fi. It’s all there, and of course the famous book is now a free public-domain resource.