Hello,
If you had enabled the cloud save, you shouldn't have to worry about it since your save should be safe in the cloud.
If not, you can find your save folder at this location:
PC: %appdata%/../LocalLow/GrizzlyGamerStudio/Robin Morningwood Adventure
OSX:
~/Library/Application Support/GrizzlyGamerStudio/Robin Morningwood Adventure
or ~/Library/Application Support/com.GrizzlyGamer.RMAWhellcum
simply back up this folder, and copy it at the same place on your new device