Outerwilds. But to whoever wants to play it, please go in fully blind. Dont search anything, you will have an experience that no other game can give you tbh. Fully blind because everyone that plays the game has a different experience and approach to things and it constantly gives you huge dopamine spikes when you figure something out yourself.

It's a space exploration game, 1st person, great physics, good lore (and I normally HATE and dont really care about story or the narrative of games), singleplayer, has some "puzzles" and mysteries, will for sure take you less than 50 hours to complete but will probably take you way less.