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I wouldn't say that the game isn't fun, but right now it seems like the crowd is moving in a very hectic manner and it's hard to isolate the patient zero even if you spot the green things when they appear (at least I'm assuming that's the illness indication). It would probably benefit from having a better description and explanation on how does it fit in the game jam's theme, because right now I'm going just off of assumptions. 
I'm loving the art and the music, tho! Good job getting the game done in the short time and see you on the next jam.

Thank you for the sincere comments! Your assumptions are mostly correct and perhaps it would be better if we had given another clue towards the Patient Zero (Spoiler: He is the only one spreading the disease and doesn't develop the symptoms). That is a difficult thing to balance cause if it becomes instantly obvious who is the patient zero, then the game loses replay value.

Regarding the theme of the gamejam, most of the characters are equal to each other and the goal is to find the only one who is different, but not in an obvious way, thus becoming a puzzle.