The simplest way is to use the cloud save system (main menu / Play / Cloud save)
if you want the actual save files, they are located there:
PC: %appdata%/../LocalLow/GrizzlyGamerStudio/Robin Morningwood Adventure
OSX: ~/Library/Application Support/GrizzlyGamerStudio/Robin Morningwood Adventure
or ~/Library/Application Support/com.GrizzlyGamer.RMAWhellcum