Preferably with links to where I can listen to it.
"Build That Wall", from Bastion (2011), composed by Darren Korb
https://www.youtube.com/watch?v=Jz8c17upEwM
This song is diagetic which I think is pretty awesome, and actually serves as a key point of characterization and worldbuilding.
Some of my favs:
"Summer Scouts" from We Know the Devil (2016), composed by Alec Lambert.
https://aleclambert.bandcamp.com/track/summer-scouts
The minimal composition and noisy/low-fi use of synths fits the game perfectly.