Games like Mystery Swords
Games like Mystery Swords include Megabonk, Resident Evil 4, Yet Another Zombie Survivors, Days Gone, and Left 4 Dead 2. We matched them by the tags players give Mystery Swords on Steam (Action, Arcade, Action Roguelike, Survival, and Zombies): closest matches first, and among equally close ones the better-known games.

Megabonk
Shared: Action Roguelike · Action · Survival

Resident Evil 4
Shared: Action · Zombies · Survival

Yet Another Zombie Survivors
Shared: Action Roguelike · Zombies · Arcade

Days Gone
Shared: Zombies · Survival · Action

Left 4 Dead 2
Shared: Zombies · Action · Survival

BALL x PIT
Shared: Action · Arcade · Action Roguelike

Crimson Desert Enhanced
Shared: Action · Singleplayer · Combat

20 Minutes Till Dawn
Shared: Action Roguelike · Survival · Combat

Vampire Survivors
Shared: Action Roguelike · Arcade · Action

The Last Stand: Aftermath
Shared: Survival · Zombies · Action Roguelike

Death Road to Canada
Shared: Action Roguelike · Zombies · Action

SCUM
Shared: Survival · Action · Zombies

Resident Evil 2
Shared: Zombies · Action · Singleplayer

Brotato
Shared: Action Roguelike · Singleplayer · Survival

Resident Evil 4 (2005)
Shared: Action · Zombies · Singleplayer

Left 4 Dead
Shared: Action · Zombies · Survival

Everything is Crab: The Animal Evolution Roguelite
Shared: Action Roguelike · Survival · Action

Hades
Shared: Action Roguelike · Action · Singleplayer

ALTF4
Shared: Survival · Action · Arcade

DayZ
Shared: Survival · Zombies · Action

State of Decay: YOSE
Shared: Survival · Zombies · Action

Resident Evil 3
Shared: Action · Zombies · Singleplayer

DEAD RISING®
Shared: Action · Zombies · Survival

Killing Floor
Shared: Zombies · Survival · Action