Cannot save to Saves folder – Issue Fix
If you get an error message about not being able to access the saves folder then you probably have a permissions issue. Try these things:
1. Run the game in administrator mode
2. If that doesn’t work, navigate to the saves folder:
C:\Users\insert username\Documents\My Games\Megaquarium\Saves
…and try to give your user profile full read/write access to these folders.
You may also need to remove “Read Only” checkbox from the folder (Windows 8.1)