After playing the game I thought of some ideas.

1. People can't last long without trade and supply lines, so why not have a stability counter somewhere that at the beginning starts at %100 and decreases over time when boats have to reroute and ports are basically closed.

2. There should be a date counter that starts at December of 2019 (since that's where stuff started going downhill.), and every minute is a month, this would be cool so you could make your own scenario. (This idea is somewhat based off of Plague Inc.)

3. Boats can get stolen/pirated near certain areas (Like Somalia, Oceania, and the Gulf of Guinea.), the boat would be then be outlined in red, this would just be an interesting mechanic.