Genuinely one-of-a-kind game. WOW.
Please, play it as soon as you can - WITHOUT LOOKING ANYTHING UP.
The mysteries and the celestial bodies of the solar system are incredible, intricate and thoughtfully crafted. Top tier worldbuilding.
The science-oriented lore, theories and their applications are captivating, as are the Nomai writings.
The music is somber and effective.
The ending took me by surprise, and at first I found it kind of unfulfiling, considering the journey to get there. It feels disconnected with the rest of the game. But I'm not gonna kid myself, it is beautiful in its own way.

The briliant thing is, this is a KNOWLEDGE GAME. Everything is always laid out in front of you, it's just up to you to understand all the pieces of the puzzle. There is not a single thing that you can unlock permanently. No upgrades. No additional equipment. The game can be completed only once you fit all the pieces of the puzzle together. I've never seen knowledge being this well implemented before.
I had to stop and admire whatever I'm looking at at least a couple dozen times during my playthrough.
This was without a doubt an unforgettable experience. What a unique game...