Awesome response, thanks so much for taking the time! :)
I know from experience that Renpy does have self voicing as an option, but the effectiveness of it varies greatly between titles depending on how the actual game works. That's why I like to ask so I can get it in the dev's own words, and you've covered all my concerns very well.
Since you mentioned that important visuals and visual status indicators have "alt text" labels, and your game has full keyboard support for navigating the UI, I'd say that this is one of the few *ACTUALLY* accessible Renpy games, though I'll need to try it to make sure.
I can't blame the devs much for not knowing that built in self voicing alone isn't enough if the game isn't made in such a way to take advantage of it, but I can definitely congratulate those who took the time to do it right. So thank you, very much! You're a good example to others, and your attention to detail is going to be very appreciated by your blind players. :)