Adding on to this to specifically recommend the Castlevania: Lords of Shadow 2 soundtrack. Oscar Araujo did masterful work on this, so much so that I even went out and bought the album, even though it was almost impossible to get my hands on it. But you can listen to it on YouTube.
I can provide some examples if you are looking for something specific but to list some games that haven’t been mentioned yet, there’s:
The Touhou games along with the remixes/covers and fan games like the two “Touhouvania” games.
Most of the Castlevania games.
Most of the Sonic games and fan games like Sonic After the Sequel and SRB2.
And to go with something really obscure, Chaos Legion.
Adding on to this to specifically recommend the Castlevania: Lords of Shadow 2 soundtrack. Oscar Araujo did masterful work on this, so much so that I even went out and bought the album, even though it was almost impossible to get my hands on it. But you can listen to it on YouTube.