* Font

The font used is "Pixel Operator" by Jayvee Enaguas (HarvettFox96). It can be downloaded here:
https://notabug.org/HarvettFox96/ttf-pixeloperator/releases
The license is Creative Commons Zero 1.0 (https://creativecommons.org/publicdomain/zero/1.0/)

* Music

Except for two songs, all music was obtained from MusOpen (musopen.org) and has a Public Domain license (https://creativecommons.org/publicdomain/mark/1.0/).

The two exceptions are:

[samayoi.ogg] 彷徨いの言葉は天に導かれ (Wandering Words Lead To Heaven)
This was obtained (as an MP3) from an archived version of the 煉獄庭園 (Rengoku Teien) website:
https://web.archive.org/web/20190115194947/http://rengoku-teien.com/mp3/other/samayoi.zip
This license for this song requires attribution.
See https://web.archive.org/web/20190920093021/http://rengoku-teien.com/rule/index.html for the exact terms.

[finale.ogg] This is an original composition by Aria. The license is "I guess you can use this in other works, but I don't really understand why you would want to."

Most files were originally MP3 files, and were modified using Audacity to trim silence at the beginning and normalize loudness to -16.0 LUFS, then converted to Ogg format.

The songs are listed in the order they appear in the game.

gymnopedie.ogg (Familiar Notes)
Gymnopédie no. 1
Composed by Erik Satie
Performed by Edward Rosser

v25.ogg (Discomfort)
Goldberg Variations, BWV. 988 - Variation 25
Composed by Johann Sebastian Bach
Performed by Shelley Katz

butterfly.ogg (Anne's Theme)
Etude Op. 25 no. 9 in G flat major - 'Butterfly'
Composed by Frédéric Chopin
Performed by Edward Neeman

tristesse.ogg (Peaceful Days)
Etude Op. 10, no. 3 in E major - 'Tristesse'
Composed by Frédéric Chopin
Performed by Edward Neeman

tarantelle.ogg (Mischief)
Tarantelle, Op. 43
Composed by Frédéric Chopin
Performed by Olga Gurevich 

aria.ogg (Aria's Theme)
Goldberg Variations, BWV 988 - Aria
Composed by Johann Sebastian Bach
Performed by Shelley Katz

wrongnote.ogg (Uneasy)
Etude Op. 25 no. 5 in E minor - 'Wrong Note'
Composed by Frédéric Chopin
Performed by Edward Neeman

nocturne48.ogg (Another World)
Nocturne in C minor, Op. 48 no. 1
Composed by Frédéric Chopin
Performed by Luke Faulkner

suicide.ogg (Imminent Death)
Preludes, Op. 28 - No. 18 'Suicide'
Composed by Frédéric Chopin
Performed by Jeannette Fang

miroirs.ogg (Danger)
Miroirs - IV. Alborada del gracioso
Composed by Maurice Ravel
Performed by Luis Sarro

nocturne92.ogg (Secret Garden)
Nocturne in E flat major, Op. 9 no. 2
Composed by Frédéric Chopin
Performed by Aya Higuchi 

allaturca.ogg (Lunia's Theme)
Piano Sonata no. 11, K. 331 - III. Alla Turca
Composed by Wolfgang Amadeus Mozart
Performed by Eduardo

nocturne55.ogg (Quiet Room)
Nocturne in F minor, Op. 55 no. 1
Composed by Frédéric Chopin
Performed by Luke Faulkner

horse.ogg (Up To No Good!)
Etude Op. 25 no. 3 in F major - 'The Horseman'
Composed by Frédéric Chopin
Performed by Edward Neeman

v5.ogg (Fooling Around)
Goldberg Variations, BWV. 988 - Variation 5
Composed by Johann Sebastian Bach
Performed by Shelley Katz

paganini.ogg (Prankster)
Etude Op. 25 no. 4 in A minor - 'Paganini'
Composed by Frédéric Chopin
Performed by Edward Neeman

nocturne93.ogg (It's Strangely Relaxing)
Nocturne in B major, Op. 9 no. 3
Composed by Frédéric Chopin
Performed by Xuan He

desperation.ogg (Last Words)
Preludes, Op. 28 - No. 8 'Desperation'
Composed by Frédéric Chopin
Performed by Jeannette Fang

unison.ogg (Kat and Kity)
Goldberg Variations, BWV. 988 - Variation 3. Canon on the unison
Composed by Johann Sebastian Bach
Performed by Shelley Katz

presto.ogg (Bringers of Chaos)
Moonlight Sonata Op. 27 No. 2 - III. Presto
Composed by Ludwig van Beethoven
Performed by Paul Pitman

waterfall.ogg (Scramble)
Etude Op. 10, no. 1 in C major - 'Waterfall'
Composed by Frédéric Chopin
Performed by Edward Neeman

pathetique.ogg (With This, I'll Change Everything)
Piano Sonata no. 8 in C minor 'Pathetique', Op. 13 - III. Rondo - Allegro
Composed by Ludwig van Beethoven
Performed by Paul Pitman

minute.ogg (Casey's Theme ~ Elegant Maid)
Waltz in D flat major 'Minute', Op. 64 no. 1
Composed by Frédéric Chopin
Performed by Olga Gurevich 

nocturne72.ogg (Somewhere I Shouldn't Be)
Nocturne in E minor, Op. posth. 72
Composed by Frédéric Chopin
Performed by Luke Faulkner

samayoi.ogg (Wandering Words Lead To Heaven)
彷徨いの言葉は天に導かれ
Composed by 煉獄庭園 (Rengoku Teien)
License: Attribution required.
See https://web.archive.org/web/20190920093021/http://rengoku-teien.com/rule/index.html.

hades.ogg (Welcome Hell)
Preludes, Op. 28 - No. 16 'Hades'
Composed by Frédéric Chopin
Performed by Jeannette Fang

pavane.ogg (Gentle Bunny)
Pavane for a Dead Princess
Composed by Maurice Ravel
Performed by Markus Staab

tempest.ogg (Truth)
Sonata no. 17 in D minor 'The Tempest', Op. 31 no. 2 - III. Allegretto
Composed by Ludwig van Beethoven
Performed by Minna Lui

finale.wav (Ending Theme)
A New Notebook
Composed by Aria
License: I guess you can use this in other works, but I don't really understand why you would want to.

* Sound Effects

Most sound effects are from the Sonniss GDC audio packs (https://sonniss.com/gameaudiogdc) and are free to use.

notebook.ogg
Cut from Paper Handling and Turning Sequence
Sounds Hunter - Paper Sound Effects
Sonniss GDC 2016 Audio Bundle

notebookclose.ogg
Cut from EFX INT HOUSE Kitchen Cupbord O_C Close Medium 01
Coll Anderson - House
Sonniss GDC 2015 Audio Bundle

clown.ogg 
Cut from EFX INT Clown Horn 01
Coll Anderson - Slapstick Comedy
Sonniss GDC 2015 Audio Bundle

lightsout.ogg
Cut from HumBuzz-Buzz-03
Detunized - HumBuzz
Sonniss GDC 2015 Audio Bundle

voice1.ogg
Cut from Atari PC2 - Floppy Failure 3
Detunized - Computer Noices
Sonniss GDC 2015 Audio Bundle

voice2.ogg
Cut from Atari PC2 - Floppy Failure 3
Detunized - Computer Noices
Sonniss GDC 2015 Audio Bundle

gun.ogg
Cut and altered from Shotgun_Quick Pump_01
TS Sound - 12 Gauge Shotgun
Sonniss GDC 2016 Audio Bundle

boom.ogg
Cut and altered from Impact_Boom_Distorted_02
Bottle Rocket Fx - Impact Collection
Sonniss GDC 2016 Audio Bundle

glass.ogg
From Glass_Break_ChampagneBottle_D50_Fienup_003
Soundopolis - Glass Smash Full
Sonniss GDC 2015 Audio Bundle

pow.ogg
From Seq1.15 Hit #1 96 HK1
NoizBoy - Hong Kong Action Kit - Hit Kit #1
Sonniss GDC 2015 Audio Bundle

whoosh.ogg
From Seq 2.1 whoosh #1 96 HK1
NoizBoy - Hong Kong Action Kit - Hit Kit #1
Sonniss GDC 2015 Audio Bundle

impact.ogg
From Rupture - Concrete_Impact_B02
SoundMorph - RUPTURE
Sonniss GDC 2016 Audio Bundle

impact2.ogg
From Rupture - Marble_Impacts_06
SoundMorph - RUPTURE
Sonniss GDC 2016 Audio Bundle

pow2.ogg
From Seq 2.27 Hit #1 96 HK1
NoizBoy - Hong Kong Action Kit - Hit Kit #1
Sonniss GDC 2015 Audio Bundle

pow3.ogg
From Seq 2.27 Hit #2 96 HK1
NoizBoy - Hong Kong Action Kit - Hit Kit #1
Sonniss GDC 2015 Audio Bundle

zap.ogg
From CK_Blaster_Shot-226
Digital Rain Lab - Lethal Energies
Sonniss GDC 2016 Audio Bundle

whip.ogg
From Swoosh_Rope_Whip_075
SoundBits -  Just Whoosh 3 _ Whoosh Essentials
Sonniss GDC 2016 Audio Bundle

chainsaw.ogg
Cut and altered from chainsaw gas big engine turn on and off mono
SoundHolder - Chainsaw
Sonniss GDC 2016 Audio Bundle

ominouswhoosh.ogg
From Whoosh_Rod_Pole_022
SoundBits -  Just Whoosh 3 _ Whoosh Essentials
Sonniss GDC 2016 Audio Bundle

crowd.ogg
Cut from Crowd Applause 4 - Light Applause, Cheer
Sound Ex Machina - Basketball Game Pro
Sonniss GDC 2015 Audio Bundle

shot.ogg 
From EFX EXT .50 Cal Pistol Shots 02 A
Coll Anderson - Guns
Sonniss GDC 2015 Audio Bundle

deference.ogg
From EFX SD Heads Hit Together 02
Coll Anderson - Slapstick Comedy
Sonniss GDC 2015 Audio Bundle

boony.ogg
Cut from EFX INT Airborne Rising and Falling 02
Coll Anderson - Slapstick Comedy
Sonniss GDC 2015 Audio Bundle

knock.ogg
This is just me knocking on my bedroom wall.
It was easier than finding a knock sound effect.
License: You can use this freely for whatver you want.

opendoor.ogg
From door_open_004
3maze -  Doors, Locks and Drawers
Sonniss GDC 2016 Audio Bundle

monster.ogg
Cut and altered from dry rusty metal impact with collapse 08 and heavy sheet metal low groan 13
Alexander Kopeikin - Black Metal
Sonniss GDC 2016 Audio Bundle

slash.ogg
Cut from Knife_Sword_Shing_Fienup_001
Soundopolis - Blades
Sonniss GDC 2015 Audio Bundle

monsterdie.ogg
Reversed version of monster.ogg.

draw.ogg
Cut from Knife_Sword_Shing_Fienup_001
Soundopolis - Blades
Sonniss GDC 2015 Audio Bundle

bell.ogg
From StartSelect,UI,set1,strings,ethnic,tonal,plucked,aura,hold_release
Eiravaein Works - Start Select
Sonniss GDC 2015 Audio Bundle

press.ogg
From vintage_radio_button_006
3maze -  Buttons and Switches
Sonniss GDC 2016 Audio Bundle

drop.ogg
Cut from SON_The_Rustle_030 - Large Thick Hedge Leaves Slapped Against Each Other
Sonocaine - The Rustle
Sonniss GDC 2016 Audio Bundle

crumple.ogg
Cut and altered from Tearing 05
Sounds Hunter - Paper Sound Effects
Sonniss GDC 2016 Audio Bundle

tear.ogg
Cut from Tearing 05
Sounds Hunter - Paper Sound Effects
Sonniss GDC 2016 Audio Bundle