Super Metroid. Shadow of the Colossus. A Link to the Past. Oddworld (specifically the Abe chapters). The Legacy of Kain series, but mostly the first Soul Reaver. Silent Hill as a general whole, with 1-3 at the top in order. Devil May Cry as a series, though it's more specific songs throughout the games as opposed to the entire OSTs (for instance, Legendary Battle 1 - Demon Emperor Mundus - Sky, Ultraviolet, Swipe of Sword, or Power of Destroyer). The vast majority of the Metal Gear saga. ALL OF GOD OF WAR (haha, God of War has god-tier music so punny, but seriously). ALL OF IT.
Yeah, this list is opinionated as fuck, but I can justify any of those if I have to.