Observation was created by several of the same developers who worked on Alien: Isolation, which makes it no surprise that the retro futuristic space aesthetic of the game is handled perfectly.
Just as with Isolation, they've done an incredibly job at making the player feel like they're truly on a space station floating around a distant planet. Again, they make use of far shots of characters and the station itself against the backdrop of the planet to make the player feel absolutely microscopic compared to the vastness of the galaxy.
Unlike Isolation however, this game fully removes the combat aspect, and a large amount of the gameplay is provided through the use of puzzles. The puzzles themselves are not very difficult to surmount since the game provides you an ample amount of clues. A large amount of the puzzles are memorization, requiring you to remember a certain pattern or image shown to you, although they are all concise. Where the complexity really shows, for me at least, was just simply trying to figure out where to go or what to do.
In addition to those puzzles providing a source of difficulty, there are several times where you're meant to interact with a small or barely noticeable object in the room (such as a piece of paper taped to a wall), and I often had issues finding them early in the game. However, as you progress through the game you get significantly better (at least in my case) at figuring out what you're meant to be looking at, so it quickly becomes a nonissue.
I personally have a pathetic sense of direction, and for those similar to me, the game's going to be a struggle to get through at points. There are several points in the game where you head outside of the space station to complete an objective, after which you're told to get back inside. It's incredibly easy to get lost out there, and I spent much too long of a time trying to figure out where I went out from, and eventually had to look up a walkthrough to figure it out. I'm unsure as to whether this was a conscious decision made by the developers - as it is at least somewhat logical, emphasizing the vastness of space and how easy it is to get lost in it - or if it was just my own fault.
Throughout the game are hidden documents that inform you more of story elements and give you a better understanding of the characters. A fair amount of them are difficult to spot, and unless you're explicitly hunting for them, there's a good chance you'll end up just moving past them and missing out on plot. The main story itself provides you with enough content to give you a general understanding of what's happening, but if you want to get a comprehensive look into the motives and actions of the other characters you'll have to be looking very closely.
The main story of the game is well written and the speed at which it progresses lays more on the slower side, but is very effective in the way it releases information to the player. It starts off very mysterious, with the player not being given much exposition apart from the absolute basic plot of the story, and ever so slowly they learn more and more about what's happening, with the last third of the game being where the story picks up substantially and major progress is made.
The slowness doesn't end with just the story, it applies to the movement and cutscenes as well. You play parts of the game as a sphere floating around the station and other parts controlling cameras, the former has somewhat realistic and expected controls when it comes to a space game; overshooting the place you want to go to and having to slowly spin yourself around. The speed at which you actually move is just slow, and oftentimes you'll be wishing that you could just move a bit faster. The panning and zooming of the cameras is also slow, and there's a little animation that happens when switching between them.
Additionally, the cutscenes have empty moments where no one on screen is really performing an action, and you're just wondering why it's taking so long for something to happen and when you'll regain controls of the character. All of these slowdowns and extra bits seem to be deliberate, and serve to help with the pacing of the game, which I personally wasn't a fan of.
Observation is a short, yet slowly paced game. It's an enjoyable adventure with an mysterious and interesting story, several puzzles to get through, and a beautiful and immersive setting to experience. However, it felt too slow at points, and there are often times where you wish the game would hold your hand a bit more and give you a better sense of what to do exactly. If I could give this game a 7/10 stars, I would, as it's a good game but just not the best.