I have a few suggestions:
- Have a save game option and saved games folder
- Make sure that when you change the name of a new nation it updates in the pop-up column
- Add a mute button
- Have a "reset zoom" option similar to the one on mapchart.net
- Add a scroll bar on pop-ups, min/max
- When you click off of min/max, it should close the min/max tab
- Add a min of all time for both age and size
- Show all of a country's revolts on its view