Also boss themes aren't pixelated

The Traveler: Phase 1-Der Bergentrückung ASGORE by Cloudjumper; Phase 2-ASGORE but it's the Final Boss; Phase 3-The True Name Strikes Back

Life: Shop-Magical Mysterious Forest | Calming The Mind, Soaring, Soothing with Flute Magical Sound

but if they gotta have an original name:
The Traveler: Phase one-The Forgotten Traveler; Phase 2-The never ending journey; Phase 3-The Last Strike

Collector: flames of creation

I LOVE THAT NAME SO MUCH

Apparently my creativity ended there because I can't think of anything for astra

Let me help!

Astra: Born by Creation

Wait I think I've got it:

Astra: uniting light

Think about it, she has made peace between the collector and several of his greatest enemies

Trollface, exotic creator, even the limitless Devourer more recently

I get it now!

Whatsapp danger

Larry: Cat attack, second phase: Mechanical kitty, third phase: Things are getting out of paw

Pearlfan’s: Guardian Archangel
Rea’s: Undead Princess
Kenshin and Cataclysma’s: Royal Siblings
Gael’s: Phantasmal Draconic

FRICK I read the note on Nugget's deleted comment
Here's what I'd probably name some of my bosses themes:

Gingerbread Man: Jingle Boom
Candystripe: Candy Canes
Awenasa: Cherokee Breeze
Dr. Desolation: Plague God

Inkmatas' theme: Scarred, Painful Calamity

Peyton's theme: Unholy Queen

Kinyani's theme: Parenting Calamity

Xander's theme: The Last Stand

Mirai's theme: Romantic Madness

Whitespace Inkmatas' theme: Blood thirst

Limitless Devourer's theme: Limitless power

Nameless Prince's theme: Restarter of Cinder

Zhandou's theme: A God of War

No like what would their original boss theme be called

oh ok lol

The Sniper: I Am Going To Kill You To Death

Phantom: Showdown In The Fields

GK: Mechanical Mayhem

SP: All Will Be Destroyed