or >OBSERVER_ as I think it's actually called
Observer is a Rutger Hauer-em'up, it's by the Layers of Fear people and it's fairly similar. Layers of Fear was an exercise in being locked in until you turned around where the level would have changed behind your back. Observer does do that, but nowhere near as much, it's not simply a Layers of Fear with the paintbrush replaced by the microchip
There's a bit more game to Observer, which is a bit of a mixed blessing. You play as Dan, an Observer, which as far as I understand it means he's a detective who can go inside people's E-brains and see their last memories. He goes to see his son in a poor district, trying to find out why he needs help and what he's doing in the slums. When he gets there he finds a headless body and can't be sure whose it it, he was attacked by someone or something and that's what most of the game is about. To get on to the trail of the killer you have to examine the crime scene, superficially that's a bit like Batman, but unless something is locked away really it's mostly a token effort, and you're just their to deep dive and experience the trippy nightmare that is their decomposing memory.
Observer isn't an especially scary game, it can be at points, but I found Layers of Fear scarier and that was more cool and clever than scary. But the cyber nightmares are an excuse to leave the more grounded reality, they can be cool, they're where the game is even if I prefer the world outside of them. They are home to the worst part of Observer; fail states. There's points where you're being hunted, there's not loads of these moments but they're the worst part. There's also some puzzles in the game, these can be a bit fiddly. It's not so much that they're testing your brain, more that you've tried everything and can see everything
I think one of its biggest problems is that it kind of buries the main story. There's 3 things going on, Dan's son, a serial killer, and an evil corporation. I get why it's paced the way it is, it's to have a middle act that doesn't feel drawn out, but it means the middle feels more important than the rest of it. There's a lot of themes running in the background, again probably too many, but it mostly handles them well
Overall I quite liked it, or bits of it. I liked the tone and the setting at least. I was pining for it to end well before it wrapped up though, it's probably a little too long but I do think it's more of a pacing issue than anything else