For Solo November I have no solo games to put on sale, but I am hoping to play a few! Have one for A Lighthouse at the Edge of the Universe, by Ella Lim, in the works.
Somewhat related, I am working on a solo / asynchronous two player ttrpg at the moment about being on Earth during an apocalypse and sending letters to space about it, or about being on a space colonist mission and writing back to the home you miss.