So, last week I bought the highly acclaimed independent video game Darwina. If you look at the screen shots, the whole aesthetic is of primitive 70's/80's video games (although rendered in a 3D that was impossible back then). Additionally, for their sound track they use a genre of music I never knew existed, Demoscene Music. Basically, music written and performed on long-obsolete music chips from old hardware (Atari ST machines, for example). You could call it a digital parallel to the Early Music phenomenon in classical music.
It's so delightfully (and authentically!) retro, I'm really enjoying it.