To restore saved games that went missing with the 1.0.11 update, please follow these directions:
1) Launch the Mac App Store and update to version 1.0.12 of Mini Metro.
1) In the Finder, hold down these keys: Shift+Command+G (or go to the top menu, click on Go, and then select Go to Folder)
2) Paste in the following: ~/Library/Containers/com.mpdigital.MiniMetro/Data/Library/
3) Find the folder called "Caches" in this folder and move it to the Desktop or Trash.
4) Run Mini Metro. It will restore the preferences and saved games BEFORE the 1.0.11.