Jedi: Fallen Order was like a rough draft for Jedi: Survivor. Everything you wished was different about the first game came true for the second game!
This game *can* be played without playing Fallen Order first, but I don't recommend it. I recommend playing Fallen Order straight through for story and getting to know the characters, first. It would really enhance your experience with Survivor if you had that foundation.
I gave 9/10 instead of 10/10 only because it was kinda buggy throughout, although it was nothing game-breaking. The map system was much improved from the first game, but it still had problems in this game, too. Other than that, I thoroughly enjoyed this game. It is beautiful, I found it immersive, and I was very invested the entire time I played.