I like retro games but i'm not really big on the nostalgia thing. Personally I prefer to play old games that I never played as a kid or only scratched the surface as I missed so many great classics as a kid. (thats why I tend to roll my eyes when folk throw the rose tinted card at me in internet debates)
However now and again I still do like to have a walk down nostalgia lane and play a old favorite.
Warsong on the Mega Drive(Langrisser 1) is one of a small handfull of games that do it for me, I only have to listen to it's soundtrack (which is amazing btw) to put my mind in some happy place.
Another is Street Fighter 2 (and also Double Dragon) ive so many good memories of play it in my local arcades and later at home on the Mega Drive.
Sonic 1 is another
Actually as I think about it, so many of the games I played as a kid don't do anything for me when I play them, however I can get that "buzz" by just listening to a soundtrack on YT.