As someone who has been solo developing an app for months concerned ape is such an inspiration. He literally spent 5 years on stardew valley with zero income. It's such a beautiful game and reminds me what you can do when you follow what feels right.
The book Blood, Sweat, and Pixels has a good chapter on the development of Stardew.
Honestly though it only reads as inspirational with the success coming at the end. 9 times out of 10 that story is actually how someone "wasted" 5 years of his life, ruined his relationship with his girlfriend that was basically supporting him the whole time, and had difficulty getting a normal job after.
The sad truth js that for every solo devs that becomes successful, there are an untold number of solo devs that don't find an audience and fail. The reality is pretty brutal in games.