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It's good to play this as a warm-up for a competitive game with friends. And good to play this game mode if you want 1v1 vs your friend (friends).
In a normal deathmatch, some heroes are useless some are way too strong and you don't want to pick heroes that take a lot of damage and they are hard to take healing from health packs (Bastion, Cassidy, etc). So in this game mode, you just need to damage someone who will die to fully heal. No one high-mobility melee character will steal your health packs cause there are not health packs.
No stupid hero game plays. Some heroes need more skill to play (for example you need to have a pretty good aim to kill someone by Moira). Skill is more viable in this game mode. For example, if you're a good widowmaker, you can kill Winston before he lands on you. For Winston, you don't have a barrier and you have much low max health, you need to think much more about your movements and how to kill any other character. On Winston you need to one-shot another player when landing, if not most probably you die. And any other character is about this philosophy: "Your skill in playing on character is more important here". There you can do some counter-pick but it's not more viable as it is in a normal game.

Changes from normal game:

No healthpacks
After earning elimination hero fully restores health over time, and current abilities' cooldown time is halved
Support role passive healing reduced from 15 per second to 12 per second
All non-support heroes have nerfed version of the support role passive
If within 40 seconds no one has dealt damage to another player, then an icon will be displayed on each character, revealing its location

Ana

Biotic Grenade healing reduced from 100 to 80
Sleep Dart cooldown reduced from 14 to 12
Sleep Dart maximum duration reduced from 5 to 4
Nano Boost reduces damage taken only by 30% instead of 50%
While Nano Boost is active all abilities cooldowns by 100% faster

Ashe

All damage dealt reduced by 11%
The headshot damage modifier increased from 2 to 2.5
Maximum ammo reduced from 12 to 10
Reload speed increased twice
Dynamite cooldown time increased from 12 to 15
Dynamite explosion time after landing increased from 2 to 3
Coach Gun knockbacks enemies by 30% weaker
Coach Gun knockbacks Ashe by 30% stronger
B.O.B. charges by 25% faster

Baptiste

Regenerative Burst healing reduced by 20%

Bastion

Hero model size while recon configuration reduced by 20%
Maximum health reduced from 300 to 225
Damaging self with secondary fire heals Bastion for the amount of taken damage (can die from self-damage if at low health)
Now Ironclad passive, instead of reducing incoming damage, gives 75 over health after using Assault and Artillery configurations
Configuration: Artillery charges by 50% faster
Configuration: Artillery duration increased by 2 times

Brigitte

Maximum healing from Inspire reduced from 75 to 60
Primary fire damage reduced from 35 to 30,1
Whip Shot damage increased from 70 to 85
Whip Shot cooldown time is reduced from 4 to 3 seconds
Whip Shot knockback reduced by 75%
Shield Bash damage reduced from 50 to 43
Rally charges by 40% faster
Barrier Shield no longer slows Birgitte while Rally
Shield Bash max range is increased by 42% while Rally

Cassidy
No changes

D.va

Hero model size reduced by 30%
Maximum health reduced to 250
Pilot D.va maximum health increased to 200
Pilot D.va movement speed increased from 5,5 to 6
Pilot D.va no longer appears after mech destruction, but she appears after using Self-Destruct
All damage dealt increased by 10%
Primary fire no longer slows D.va
Micro Missiles cooldown time reduced from 7 to 6
Micro Missiles and pilot D.va's primary fire projectiles speed increased by 50%
Bosters cooldown time reduced from 4 to 3
Boosters maximum speed increased by 30%
Defense Matrix maximum duration reduced from 3 to 2
Boosters, Call Mech and Self-Destruct knockbacks by 30% stronger

Doomfist

Hero model size reduced by 10%
Maximum health reduced to 250
All damage dealt increased by 20%
Seismic Slam cooldown time reduced from 7 to 5
Power Block cooldown time reduced from 8 to 6

Echo
No changes

Genji
No changes

Hanzo
No changes

Junker Queen

Hero model size reduced by 15%
Maximum health reduced to 250
All damage dealt increased by 8%
Commanding shout removed
Jagged Blade cooldown time reduced from 6 to 3
Jagged Blade projectile speed increased by 33%
Jagged Blade maximum travel distance increased by 33%
Jagged Blade pulls enemies 33% stronger
Carnage cooldown time reduced from 8 to 6 seconds
While using Carnage movement speed increased by 60% then the bonus gradually fades out after 1 second
Now has a new passive which reduces all damage taken by 1% for each 2% missing health
Rampage charges by 20% faster

Junkrat

RIP-Tire maximum damage dealt reduced from 600 to 360
RIP-Tire charges by 15% faster

Kiriko

Swift Step cooldown time increased from 7 to 10
Swift Step mechanic greatly changed:
Now Kunai leave mark. At one time only 5 marks can be placed. Marks can only be placed on the enemies or on the ground. If another mark is in 5 meters range new mark won't place. If 5 marks exist and there is no other marker within 5 meters, then the nearest mark will be moved to a new location
Swift Step can only be used on marks. After using Swift step targeted mark will disappear
Swift Step doesn't have animation, sound or effects, instead, it has Tracer Recall effect
Swift Step doesn't clear debuffs, but it also has a cast time, a short period of time invulnerability after teleporting, and can still be cancelled by crowd-control
Kitsune Rush charges by 37% faster

Lucio

All damage dealt increased by 9%
Crossfade healing reduced by 20%
Sound Barrier charges by 75% faster

Mei

Maximum health reduced from 250 to 200
A successful hit with secondary fire restores 5 ammo. Headshot restores additional 5 ammo
Cryo-Freeze no longer restores ammo
Cryo-Freeze maximum duration reduced from 4,22 to 2,88
Cryo-Freeze maximum healing reduced from 150 to 120
Blizzard charges by 20% faster

Mercy
Disabled. Would be added when I make a no target needed Guardian Angel version

Moira

Maximum health increased from 200 to 225
All damage dealt outside ultimate increased by 50%, inside ultimate by 14%
Now heals for 40% of damage dealt
Secondary fire needs to aim
Biotic Orb cooldown time increased from 8 to 11
Biotic Orb projectile speed increased by 50%
Maximum possible damage from Biotic Orb reduced from 200 to 60
Healing Biotic Orb can't heal Moira (damaging orb still has lifesteal effect)
Moira automatically uses a damage-dealing Biotic Orb
Fade cooldown time increased from 6 to 9 seconds
Fade max travel distance increased by 30%
Fade increases movement speed by 80% This bonus gradually fades out after 2 seconds
Ultimate charges by 50% faster
Ultimate no longer heals Moira passively
While ultimate heals for 80% of damage dealt
Coalescence resets Fade cooldown time
Coalescence can be cancelled by using Fade

Orisa
Disabled forever

Pharah

Maximum ammo reduced from 6 to 5
Damaging self with primary fire heals Pharah for the amount of taken damage (can die from self-damage if at low health)
Hover Jets maximum flying time and recharge time increased by 5%
Barrage resets abilities' cooldown time
Barrage can be cancelled by pressing Jump Jet or/and primary fire buttons
Barrage damage dealt reduced by 25%

Ramattra

Hero model size outside Nemesis form reduced by 10%
Hero model size inside Nemesis form reduced by 25%
Maximum health reduced to 225
Void Barrier health reduced from 1000 to 750
All damage dealt increased by 33%
Projectile speed increased by 50%
Nemesis Form cooldown time reduced from 8 to 2
Nemesis Form no longer provides additional health and movement speed
Annihilation provides a 30% increased movement speed
Enemies within Annihilation range deal 35% less damage

Reaper

No longer has lifesteal passive
Wraith Form cooldown time reduced from 8 to 6
Shadow Step cooldown time reduced from 10 to 3
Shadow Step can't be used for 3 seconds after dealing or taking damage
Shadow Step animation cancels after taking damage
Death Blossom resets Wraith Form cooldown time
Death Blossom can be cancelled by pressing Wraith Form or/and primary fire buttons
Death Blossom movement speed penalty nerfed by 50%

Reinhardt

Hero model and barrier Field sizes reduced by 30%
Maximum health reduced to 250
Primary fire no longer knockback
Primary fire maximum range reduced by 30%
Barrier Field no longer has a movement speed penalty
Barrier Field health reduced from 1200 to 332
Fire Strike cooldown time reduced from 6 to 4

Roadhog

Hero model size reduced by 25%
All damage dealt increased by 20%
Maximum health reduced to 250
Maximum ammo reduced from 6 to 4
Now backward movement speed is the same as when running forward (in a normal game, backward movement speed is 90% of the normal forward movement speed for all characters)
Take a breather healing reduced from 350 to 126
Chain hook no longer provides slow to Roadhog.
Chain Hook Max range reduced by 25%
Take a Breather cooldown time increased from 8 to 10
Take a Breather reduces damage taken by only 30% instead of a 50%
Take a Breather healing increased from 126 to 248,5
While Take a Breather is active movement speed is increased by 50%
Ultimate charges by 25% faster

Sigma

Hero model size reduced by 30%
Maximum health reduced from 400 to 200
All damage dealt increased by 5%
Barrier size is strongly reduced
Experimental Barrier maximum health reduced from 700 to 350
Experimental Barrier cooldown time after destruction increased from 5 to 10
Experimental Barrier regeneration rate reduced from 100 to 50
Accretion cooldown time reduced from 10 to 8

Sojourn

Railgun charges by 30% faster

Soldier: 76

Primary fire damage increased from 18 to 19
Damaging self with secondary fire heals Soldier: 76 for the amount of taken damage (can die from self-damage if at low health)
Biotic Field healing per second reduced from 35 to 30

Sombra
No changes

Symmetra

All damage dealt increased by 12%
Maximum health reduced from 225 to 200
Damaging an enemy with primary fire restores ammo
Sentry Turret disabled
Teleporter cooldown reduced from 12 to 9
While Photon Barrier is active Teleporter has no cooldown time

Torbjorn

Forge Hammer provides 20% increased movement speed
Maximum ammo increased from 18 to 20
Earning elimination fully restores ammo
Deploy Turret disabled
Overload cooldown time reduced from 10 to 7,5
Overload duration increased from 5 to 6,25
Molten Core provides 100 additional health
Ultimate charges by 40% faster
Molten Core duration increased from 10 to 15

Tracer
No changes

Widowmaker

Maximum health increased from 175 to 200
Sniper mode shot at full charge deals only 105 and 262.5 damage in a headshot
While Infra-Sight, sniper mode shot at full charge deals 120 damage and 300 damage in a headshot

Winston

Hero model size reduced by 30%
Maximum health reduced to 250
All damage dealt increased by 10%
Secondary fire on a target further than 4.5 meters deal additional 75% more damage
Secondary fire ammo usage increased from 12 to 25
Barrier Projector disabled
Jump Pack cooldown time reduced from 5 to 4
Jump Pack no longer do knockback
Primal Rage increases maximum health only to 350
Primal Rage charges by 12% faster
Primal Rage hits do 25% weaker knockbacks
When dealing 38 damage while Primal Rage, the target will be stunned for 0,1 seconds and the cooldown of Jump Pack is reset
Primal Rage duration reduced by 30%