Games like Xmas Apocalypse
Games like Xmas Apocalypse include Soulstone Survivors, Warframe, Risk of Rain 2, Fallout 4, and Yet Another Zombie Survivors. We matched them by the tags players give Xmas Apocalypse on Steam (Third-Person Shooter, Shooter, Bullet Heaven, Roguelite, and Stylized): closest matches first, and among equally close ones the better-known games.

Soulstone Survivors
Shared: Bullet Heaven · Roguelite · Action RPG

Warframe
Shared: Third-Person Shooter · Action RPG · RPG

Risk of Rain 2
Shared: Third-Person Shooter · Roguelite · Shooter

Fallout 4
Shared: Shooter · RPG · Post-apocalyptic

Yet Another Zombie Survivors
Shared: Bullet Heaven · Roguelite · Action Roguelike

Megabonk
Shared: Bullet Heaven · Roguelite · Action Roguelike

Nova Drift
Shared: Roguelite · Shoot 'Em Up · Bullet Heaven

REMNANT II®
Shared: Third-Person Shooter · Shooter · RPG

Death Must Die
Shared: Roguelite · Bullet Heaven · RPG

Remnant: From the Ashes
Shared: Third-Person Shooter · RPG · Shooter

Marvel Rivals
Shared: Third-Person Shooter · Shooter · RPG

The Killing Antidote
Shared: Third-Person Shooter · Shooter · 3D

OUTRIDERS
Shared: Third-Person Shooter · RPG · Shooter

The First Descendant
Shared: Third-Person Shooter · Shooter · RPG

Tom Clancy’s The Division™
Shared: Third-Person Shooter · Shooter · RPG

Halls of Torment
Shared: Roguelite · Action Roguelike · Action RPG

Snowbreak: Containment Zone
Shared: Third-Person Shooter · Shooter · RPG

Night Swarm
Shared: Bullet Heaven · Roguelite · RPG

PUBG: BATTLEGROUNDS
Shared: Shooter · Third-Person Shooter · Action

Nordic Ashes: Survivors of Ragnarok
Shared: Bullet Heaven · Roguelite · Action RPG

20 Minutes Till Dawn
Shared: Roguelite · Action Roguelike · Shoot 'Em Up

The Last of Us™ Part I
Shared: Shooter · Third-Person Shooter · Post-apocalyptic

Grand Theft Auto V Legacy
Shared: Shooter · Third-Person Shooter · Action

Tom Clancy’s The Division® 2
Shared: Third-Person Shooter · Shooter · RPG