I started playing Outer Wilds without knowing absolutely anything about it, and I think that's the best way to get in to it. So my review will be as spoiler free as I can make it.
I don't think i've ever played a game like it. It begins with a simple quest to explore the solar system and then starts to build a really big mistery about its planets. The flying is really fun, but difficult. But that kind of physic based flying can let you do some amazing stuff in emergency situations.
The puzzles are of varied difficulty, and one of the final puzzles is REALLY hard and might make you take a while to win the game because of it. That may be my only complaint about the whole game.
The music is great and the ambientation in general is superb. Each planet feels really unique and interesting. All planets contain a certain degree of mistery that you will try to understand.
The ending of the game is amazing and it was kind of emotional for me, I feel like i'm not the only one that felt that way.
So I can't state it enough. GET THIS GAME. If you like adventure, mistery and rewarding puzzles, this game will blow your mind.
The only way I think you wouldn't enjoy this game is if you don't like reading at all, but if you read this far I would believe that's not the case.