Potential challenges: Ensuring medical accuracy without making it too complex for casual players, balancing fun and educational value, engaging both newcomers and those who played the first version.
Visual style: Cartoonish and colorful for accessibility, or realistic 3D graphics for immersion. Sound design with calming or tense music depending on the situation.
What about the digital aspect? Integration with real medical data, AI-generated patients with unique needs, adaptive difficulty based on the player's performance. Could also include a tutorial mode for new players and a competitive mode for experts.