Seems to be 3 audio assets used for for the music in 5-1. 'abyssalcavedrone', 'abyssalloopfastcalm', and 'abyssalloopfast'. All I have done is upload it to SC.

0:00 abyssalcavedrone (Drone Intro)
0:42 abyssalloopfastcalm (Calm Loop)
2:50 abyssalloopfast (Combat Loop)

enjoy the sax

devilmayquake.com

ULTRAKILL - Deep Blue (has Sax)

14 - The Death Of God's Will (Incl. "Horns Of Insurrection")

08 - Death Odyssey

05 - Duel (Versus Reprise)

ULTRAKILL: PANDEMONIUM/WAR

ULTRAKILL OST: PANDEMONIUM P-2 Theme #2

ULTRAKILL OST: WAR P-2 Theme #3

ULTRAKILL Violence OST: Hear! The Siren Song Call of Death: Combat

Heaven Pierce Her - The World Looks White (ULTRAKILL 7-1 Theme #1)

Heaven Pierce Her - Danse Macabre (ULTRAKILL 7-3 Theme #2)

Heaven Pierce Her - War Without Reason (ULTRAKILL 7-4 Theme)

ears 1 80 bpm take 1 2925

ULTRAKILL Violence OST: Hear! The Siren Song Call of Death: Combat

The Lonely Lump