Does this work for decrypting saved games files?

[fmnxl]

With the guide I managed to extract the AES keys and opened the .pak file. I'm wondering if saved game files are also encrypted with the same key(s)?

I tried using the key to decrypt the file but it didn't work for me, but I'm hoping someone knows more what's the typical strategy.

I used a hex editor to see the histogram and confirmed that it's encrypted.

Here is the .sav file:
Island.zip
(someone with access to the key decrypted it for me, but i want to figure out the key for myself)

[Cracko298]

What's the game name?