Thanks for passing that on, and please thank your brother! He is exactly right. There were no strict guardrails on purpose: the small model I use simply had nothing to say once the talk left the illness, so it fell back to "I don't know". That was boring, so I just fixed it.
Say Ahh! - AI Doctor Game v0.4.2 is out, and it is the funny update. What is new: every patient now has one comic habit (a drama queen, a Dr. Google fan, someone who blames everybody else, a penny-pincher, a foodie, an absent-minded one, a bragger, a superstitious one, a TV-show fan) and now and then adds a dry aside to a normal answer. Example: "I told my family it might be the end. They asked if I could buy milk on the way home." Chatting off-topic gets real answers now, and if you ask for a joke, you get one (the patient even laughs at yours). The examinations got little remarks too, like "Ooh, that is cold!". All of this is hand-written in English, German, French and Spanish, so the jokes survive the translation. I also fixed an annoying bug where patients tacked "thank you, doctor" onto every answer.
The download is now about 440 MB (it started at 1.4 GB), and German, French and Spanish are optional language packs. Play it here: https://prawns-agent.itch.io/say-ahh - I would love to hear which patient made you or your brother laugh, and as a native French speaker, whether the French jokes work for you. Thank you for the support and for spotlighting the game!