In my 3 playthroughs, my mistakes seem to significantly concentrate on dark-skinned people. I have trouble telling if they have skin problem (red/pale/green). I wish there's a guideline for dark-skinned. The user would be able to turn a toggle from light-skin to dark-skin, to view two different type of symptom screenshots for reference.
That being said, a new set of symptom models do make the game user-friendly, but it could make the game a bit less challenging, and I am sure there'd be some kind of user-made tutorials when this game is officially released... So it depends on game designers' view. Overall I think this game has a promising potential. Congratulations to yall's achievement so far.
A small additional suggestion is that could we have more guns to purchase from, since there surely are plenty of gun-related assets to easily grab from... and the current pistol looks a bit too sci-fi and thus not enough believable.