Homeworld and Homeworld: Cataclysm for me. Some of the earliest exampels of games that made me actually FEEL genuine emotions. From majestic awe at the launching of the Mothership, to anger at the destruction of our starting planet, and everything in between. Just, really solid storytelling for me.
Oddly I would say Life is Strange 1. Mostly because, while people like to ***** about "it's teenager speak written by adult dudes" , in a lot of ways, it really isn't. I REMEMBER being that awkward kid at that age, and it was decades before these kids era. The flavor of what they're talking about is the same, even if the details are more modern. The way emotions feel more raw when your a teenager, so everything is ramped to 11 as far as it's importance to you, and your reactions to it. I was a teenager in the 90s, and that game was in the 2010's ish era, and it still felt relatable to me.
The first Thief game. Mostly because I remember how much fun I had figuring out novel ways to resolve the various heists, including an ending to the final boss "fight" that I think was brand new at the time. I'd certainly never seen anyone mention it before as a strategy.
That's all I can think of currently. I don't suffer nostalgia all that much, at least not as often as others. I miss being healthy like I was as a kid, having a body that doesn't hurt. But the whole "I wish I was back in my LIFE as a teenager" ? Eh, I could do without it in a LOT of ways.