To answer your last question, for Paper Sorcerer:
I use ORK in Unity, and it's built in that savegames are saved in a preset directory, persistentDataPath:
Windows save files location: C:\Users\username\AppData\LocalLow\UltraRunaway\Paper Sorcerer
Mac save location: Users/username/library/cache/UltraRunaway/Paper Sorcerer
Linux saves: /home/[username]/.config/unity3d/UltraRunaway/Paper Sorcerer
Since it's a file location set by Unity, it isn't possible for me to change the directory manually.