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)

22 - Meganeko - The Cyber Grind

05 - Duel (Versus Reprise)

Ultrakill - The cyber grind Early/Old theme

KEYGEN CHURCH - Tenebre Rosso Sangue (UltraKill P-2 theme)

haiiiii ^_^ hi!! hiiiiii <3 haiiiiii hii :3
all credit to keygen church and hakita ultrakill

Tenebre Rosso Sangue

KEYGEN CHURCH - Tenebre Rosso Sangue

I DO NOT OWN THIS

original by Keygen Church - https://youtu.be/KTCC053fLqs

Ultrakill is by Hakita

KEYGEN CHURCH - UltraChurch

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

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

zonedout - fractured light (prod. phntmzn bR)

Into the Fire from the upcoming game by new blood entertainment, ULTRAKILL. I do not own this track or any others. All credit goes to Hakita and New Blood Entertainment.

Ultrakill - Into the Fire

Overkill