The refueling music is the best part of the soundtrack, and somehow that video doesn't have it...different version of the game?
"Bogey at your 6", the combat theme from the game, but remixed as if Konami had made it for the VRC6, the NES mapper chip that added 3 additional oscillators that made the Japanese release of Castlevania III what it was; he made this using Scream Tracker (or possibly a newer tracker, but its saved in S3M format), because tracker-like chip emulators didn't exist yet (Furnace, et al).
In the Halls of the Usurper (Pridemoor Keep) https://youtu.be/B9ICOx8YWWw
Fighting with All of Our Might https://youtu.be/Sv9IhzPPkxg