Current list of changed sounds, in order by category

Monsters

-Thumper: all noises have been replaced with the Cleric Beast from Bloodborne

-Jester: cranking music and the scream after popping have been replaced with the Evangelion theme and Spanish dub Shinji respectively

-Eyeless Dog: roar when spotting a player has been replaced with "OK I pull up" from the song 'After Party' by Don Toliver

-Bunker Spider: steps when walking are now the Vine Boom Thud, attacking a player will play Jerma's "giant enemy spider," as will killing the spider

-Baboon Hawk: caws and yelps have been replaced with various YTP and Family Guy quips

-Nutcracker: marching tune has been replaced with BFG Division from Doom 2016

-Coilhead: the noise that plays when it kills a player has been replaced with Peter Griffin saying, "I'm coming", noise when frozen by being looked at has been replaced with the stalker scream from Half Life 2

-Earth Leviathan: the breaching sound that plays when it attacks a player has been replaced with "PINGAS" from YTPs and their cry through the sky is now "IM BACK IN THE F***ING BUILDING AGAIN" from SnapCube's Sonic fandub

-Forest Giant: when a forest giant eats a player, it now plays Cookie Monster eating cookies from Sesame Street

-Old Bird: the various noises they make while attacking players and creatures have been changed to these sounds: HELP MEE, Heavy from TF2 crying, Gabriel from ULTRAKILL's "Hate" speech, "Lettuce" from Burger King Foot Lettuce. The music that plays when an Old Bird chases a player has been replaced with "Order" from ULTRAKILL

-Masked: puking SFX has been replaced with Peter Griffin and Stewie Griffin from Family Guy throwing up

-Tulip Snake: their wing flapping noise is now the opening to Pompeii by Bastille

-Butler: the ambient buzzing of the Butler has been replaced with Frozen Year by Foopap, as well as the Butler Bees SFX. The theme produced by an aggro Butler is now Adam Smasher by P.T. Adamczyk from Cyberpunk 2077

-Maneater: baby Maneater cries have been replaced with "wAa," upon eating scrap makes the nom nom nom Roblox sound, and when transforming plays I'm So Sick by Flyleaf

-MISC: Creatures like the Bunker Spider, Spore Lizard, and other monsters that rely on the "steps" SFX will use the Vine Boom Thud noise.

Hazards/Items

-Bees: the idle hive buzz and attacking buzz have been replaced with music curtesy of @Foopap on Spotify

-Stun Grenade: explosion sound has been replaced with Mt. Vesuvius vs Baby

-Item Drop Ship: ice cream song has been replaced with music curtesy of @Foopap on Spotify

-Mines: the activation noise right before they explode has been changed to "WTF BOOM"

-Ceiling Spike Traps: the slamming noise has been replaced with the Minecraft Anvil placing noise

-Bridge Collapse: the noise when a bridge collapses has been replaced with the "They hit the Pentagon Lyle!" Zach Hadel voice clip

-Lockpicker: the noise that plays when picking a locked door now has an alternating replacement with one of three Payday 2 Assault themes (currently only plays every other time the lockpicker is used, unintentional and will be fixed soon)

-Shovel: now plays Scout from Team Fortress 2 going "Boink!" or "Bonk!" as well as the opening riff of "Bad to the Bone" by George Thorogood

-Signal Translator: now plays sans SFX from Undertale

-Toy Robot: now plays every Markiplier intro at once

-Falling: if you take lethal fall damage, the Kirby Yelling meme now plays

-Lightning: lightning and thunder now play quips from Thunderstruck by AC/DC

-Shotgun: equipping the shotgun now plays the opening motif of the Terminator 2 theme song

-Company Cruiser: radio now plays Loonboon by Ruscel Torres, and WAR and WAR WITHOUT REASON from ULTRAKILL. On explosion plays "F***ING KANGAROO"

Misc

-'Adrenaline' noise: sounds that play when you see a monster/body have 2 replacements; Hog Rider Yell from Clash Royale and Ludwig the Holy Blade from Bloodborne

-Ship Travel SFX: the sounds that play as the ship flies to a moon have been replaced with "Summon in the Sunlight" by Jameserton from 'Happy Souls'

-Ambience: the ambient theme during an Eclipse has been changed Dark Fantasy Realm Ambience, and the blizzard sounds that play on the "Ice Moons" has been replaced with "a winter that kills" by Unworn

-All Players Died: the sound that plays when every player died on a moon has been replaced with the YOU DIED sound from Dark Souls

-Getting Fired: when you fail to meet the profit quota, the voiceline played from the ship is now the audio from the "YOU'RE CRINGE!" SpongeBob meme

-Elevator: jingle has been replaced with Grasswalk and Moongrains by Ruscel Torres