Yes and no. It's a combination of tracing photos and colouring for the characters and filtered photos and small amount of AI (1%) for the backgrounds. I've published a step by step tutorial somewhere . Thank you.
You're right. Although I still work to release the endings, my daily dev time available has shortened substantially. I even stopped the billing cycle for the 3rd month this year. The good news is that since I never did this for the money, just for my creative passion, I'm not even thinking about stopping. I'll keep on working every day even if I only have an hour or two available or no patrons left until I reach the end, hopefully before the end of the year.