Wow massive kudos to you for this project ! Regarding all the references I hope you made it into a paper ! It communicates the complex situation very well. - - To simulate different risks of transmission you could add (invisible or marked) zones in the map that elevate risk (mall, sports, or use a noise map since the patients move randomly anyway). Might over-complicate things but since you mention it prominently under limitations.
ExtraLegalStar25
I somehow got 11 survivours with the code I just posted you on Aug 4 2020.
kikill
Interesting. You can post your level code and score on the game page. It might just challenge someone!