TLDR: It's just like Portal 2 with two big differences - very different main mechanic and much more cringe dialogue. But that still means that this is an amazing game!

From the very beginning, you can't escape the Portal 2 comparisons. You wake up in an abandoned research facility and you're tasked to solve puzzles by an AI sidekick. The game basically plays just like Portal 2 (and that's a good thing).

The main mechanic is a gun that rewinds objects in time. That allows for some quite interesting puzzle design. Unlike in Portal 2, it's not that much about the movement of the player, but more about the movement (and interactions) of puzzle elements. As expected, the puzzles start rather simple (like moving a box onto a pressure plate) and very gradually ramp up in difficulty, though it never gets insanely hard. Every cca. 5 puzzles, a new mechanic is introduced adding some variance to the solutions. Some mechanics are familiar (lasers, lifts), some quite unique (foldable boxes, rivers).

Another big strength of the game are the environments. The research facility is beautiful! You have plants overgrowing the puzzle areas, offices, common spaces. There's a lot of attention to detail, a lot of environmental storytelling. You can see how the people used to live there, you can read their emails, you can watch onboarding slide shows for newjoiners, ... it is all very immersive. Often the environments provide their own puzzles in between the proper "puzzle rooms" and often this involves something collapsing and you repairing it by rewinding it in time.

One notable negative on the whole game is the super cringe dialogue between the protagonist and the AI sidekick, like ...
"Hey, this door doesn't open."
"Would you like me to file an IT ticket?"
"No. I don't think anybody is alive to read the IT ticket."
"Understood. Helpfulness attitude reduced by 50%."

But a cringe dialogue doesn't ruin a beautiful and original puzzle game, so for me this is an easy recommendation!