A beta Undertale AU that plays like HELP_tale, In a way. You have to complete the entire game before getting access to the power to spare monsters, called "Hard Mode" in the game, because no killing means you're stuck at 20 HP.

UNDERBOUND

UNDERTALE Soundtrack

sans.

DELTARUNE Chapter 1 (Original Game Soundtrack)

Cliffs

Rude Buster

Home

Your Best Friend

Home (Music Box)

You Idiot

It's "Mom!"
Gosh, I hope nothing upsetting happens to her!

Guardian Angel

Re-up. Breaking the alternating theme here, but this was a fusion of sorts; Undertale's Menu and Synchrony/Synchronicity from Brandish 2. I thought it'd be interesting to try!
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Track Trivia:
--- This was supposed to be the first of Undertale and Brandish theme fusions, but I never went through with it. Maybe some day?
--- Strangely enough, this was one of the ones I had the most fun with! Simplicity, I suppose.

Menu ~ Synchrony

Track by @taeskull3
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Game Over.

Lord, I feel the greatest evil for my shortcomings.
My body has been destroyed.

If I can see the fire again…
You'll restore me to animation, won't you?

12 - Drowning

001 - Once Upon A Time

Undertale Yellow Soundtrack

Snowfall

Track @alminuminuminum 
---
* You're right.
* I've been through worse.
---
Napstablook buckles quickly.

15 - Ectoplasmic Tears

09. Shop

Track by @casserole12345
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* Oh hey, kid.
* You know my name.
* Agtz.
* ...
* What?
* You want a pat on the back?
* Some pets?
* Should I bow? 
* Maybe, I don’t get it.
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Ice Caves

33 - Icebound

[Dialogue was not archived.]
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Nothing much to really note from this sequence apart from Frisk's sprite. When I check the Menu, it seemingly glitches out looking at my own stats, and it won't even show the name.
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@cheressaturn

Ruins (2014)

[Dialogue was not archived.]
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For some reason, "Uwa!! So Temperate!" is missing from both the game's files and the settings menu. We continued on and encountered a Froggit, with Toriel scaring it away soon after.
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@cheressaturn

Anticipation (2014)

[Dialogue was not archived.]
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Sharky again. Something strange just happened with Toriel.
Out of nowhere, she started seemingly... talking to herself? And she just ran off while telling me to stay behind.
Thinking this is just a strange version of the Unnecessary Tension replacement, I follow her, only to be greeted by the Ruins suddenly drastically changing in layout. 
Confused, I explore the area for answers and... encounter an enemy.
Theme is a bit different from what I recall, but the killing/sparing system still seems to be intact. However, a few animations are bugged, and Whimsun's sprite in particular looks a little strange.
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@cheressaturn

Enemy Approaching (2014)

[*To think I wanted to protect you.]
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Strangely, the second I went to the save point at Toriel's house, the game went to a cutscene of Toriel suddenly stopping me from entering her home. She describes that monsters have been going around telling her what I've been doing, and instead of elaborating I was just sent straight to this fight.
Surprisingly, rather than ending like the original Toriel fight with her being one shot, she seems to be a lot stronger.
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@cronixix

Heartbreak

SANS!
WHAT THE HECK!?
(The battle suddenly pauses.)
* sup, bro?
YOU KNOW WHAT'S "SUP" BROTHER!
IT'S BEEN EIGHT DAYS AND YOU HAVEN'T...
RECALIBRATED.
YOUR.
PUZZ-
* hold that thought.
* i'm a little busy here.
BUSY DOING WHAT??
WASTING MY TIME?!
WHAT ARE YOU EVEN DOING??
* capturing this human i found.
* it's really fun.
* do you wanna help?
NO! I HAVE BETTER THINGS THAN TO CAPTURE A-
A...
DID YOU JUST SAY HUMAN?!
* uh, yeah?
OH.
MY.
GOD.
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No matter whether we spared or fought, Papyrus just interrupts the battle and seemingly cuts it short.
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@cheressaturn
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Nyeh Heh Heh! (2014)

I'd like to think that Storyshift Chara's fight wouldn't have any magic or complex bullet patterns, but there would be a hybrid of the green and purple soul modes to visualize physical attacks/blocking. It'd be like traditional RPGs where you block, dodge, etc (CHARA used SLASH!) but because it's a fistfight Chara can just skip your turn if you're not fast enough. Because their attacks are physical, Chara can brake your bones or make you bleed to death, so even getting hit once can be deadly. If you manage to kill Chara without bleeding to death, fainting from pain or getting knocked out then you could maybe kill sans

UNDERBOUND

CodeKraftHK