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Menu: Noisestorm - Crab Rave
Dead note: Tony Igy - Astronomia
Arcade: Rammstein - Radio
Library: Nichijou - Maa Maa No Kiseki
Secret room: Nichijou - Satori No Kyochi
Super secret room: Nichijou - Maa Maa No Kiseki
Devil room (Sraken room): Rammstein - Du Hast
Angel room (MashaTanya room): Noisestorm - Crab Rave
Shop: Kevin MacLeod - Elevator
=Chapter 1=
Basement (Subgornaya): Rammstein - Haifisch
Cellar (Subgornaya): Rammstein - Ach so gern
Burning basement (Subgornaya): Vitalic - Poison Lips
Downpour (Rainy subgornaya): Rammstein - Rosenrot (Mirror: Rammstein - Engel)
Dross (Sragornaya): Lindemann - G-Spot Michael (Mirror: Lindemann - Platz eins)
=Chapter 2=
Caves (Streets): Rammstein - Tattoo
Catacombs (Streets): Rammstein - Links 2 3 4
Flooded caves (Rainy streets): Rammstein - ♥♥♥♥♥
Mines (Dark roads): Rammstein - Auslander
Ashpit (Snow roads): Lindemann - Steh Auf
=Chapter 3=
Depths (Roads): Rammstein - Feuer frei!
Necropolis (Roads): Rammstein - Rein Raus
Dank depths (Roads): Lindemann - Mathematik ft. Haftbefehl
Mausoleum (Far streets): Rammstein - Hallomann
Gehenna (Far streets): Lindemann - Gummi
=Chapter 4=
Womb (Centre): Rammstein - Weit Weg
Utero (Center): Rammstein - Ich tu dir weh
Scarred womb (Blood centre): Lindemann - Blut
Corpse (Night centre): Lindemann - Allesfresser
=Chapter 4.5=
Blue womb (Streets III): Rammstein - Puppe
=Chapter 5=
Sheol (Border): Rammstein - Benzin
Cathedral (RR park): Rammstein - Mein Land
=Chapter 6=
Dark room (Zaboy): Lindemann - Frau & Mann
Chest (Bridge): Rammstein - Sex
=Chapter 7=
Void (Village): Rammstein - Deutchland
Ascent (Going back): Lindemann - Ich Hasse Kinder
=Chapter 8=
Home (House of Bench owner): DIGITAL ez LG - Menu theme
= Fighting music =
Boss 1: Feint - Snake Eyes (feat. CoMa)
Boss 2: Rammstein - Sex
Boss altpath: Lindemann - Fish On
Mom's leg/Heart (Levka's 1&2 fight): Katana Zero - Psychotherapy
Isaac/??? fight (Nikidot/Kostaun fight): John Cena - The Time Is Now
Satan fight (Sraken fight): JoJo's Bizarre Adventure - Pillar Men Theme
Lamb fight (Masol fight): Super Meat Boy - Hot Damned
Hush fight (Anton fight): Rammstein - Zeig Dich
Ultra greed fight (Ultra Grisha fight): Pillar Men Theme remix by F1REX
Delirium fight (Not renamed yet): Rammstein - Mein Teil
Mother fight (Lev 3 fight): Lindemann - Ich weiß es nicht
Dogma fight (Not stream fight): Lindemann - Ich Hasse Kinder Instrumental
Dogma fight phase 2: Rammstein - Deutchland
Ultra famine fight (Mega Uibui Levka fight): Lindemann - Ich weiß es nicht
Ultra pestilence fight (Mega Uibui Nikita fight): Rammstein - Du Hast
Ultra war fight (Mega Uibui Anton fight): Lindemann - Gummi
Ultra death fight (Mega Uibui Kostya fight): Lindemann - Fish On
Beast fight (Main devil fight): Rammstein - Radio

Not mentioned music does not have a source (few been made by my friend).