Games like Orc killer
Games like Orc killer include BioShock Infinite, The Ascent, Black Myth: Wukong, Escape From Duckov, and ATLYSS. We matched them by the tags players give Orc killer on Steam (RPG, Tower Defense, Shooter, Arcade, and 3D Platformer): closest matches first, and among equally close ones the better-known games.

BioShock Infinite
Shared: Shooter · RPG · Action

The Ascent
Shared: RPG · Top-Down Shooter · Shooter

Black Myth: Wukong
Shared: RPG · Action · 3D

Escape From Duckov
Shared: Shooter · Top-Down Shooter · Adventure

ATLYSS
Shared: RPG · 3D Platformer · 3D

Middle-earth: Shadow of War
Shared: RPG · Fantasy · Action

Sky Force Reloaded
Shared: Arcade · Top-Down Shooter · Bullet Hell

Halls of Torment
Shared: Bullet Hell · RPG · Arcade

BALL x PIT
Shared: Arcade · Bullet Hell · Top-Down Shooter

ACE COMBAT™ 7: SKIES UNKNOWN
Shared: Arcade · Shooter · 3D

The Witcher 3: Wild Hunt — Remastered
Shared: RPG · Fantasy · Adventure

Orcs Must Die! 2
Shared: Tower Defense · RPG · Action

Yet Another Zombie Survivors
Shared: Top-Down Shooter · Arcade · RPG

Goobies
Shared: Top-Down Shooter · Bullet Hell · RPG

Rogue Legacy 2
Shared: Arcade · RPG · Action

Gothic 1 Remake
Shared: RPG · Adventure · Action

Minishoot' Adventures
Shared: RPG · Bullet Hell · Top-Down

Borderlands 2
Shared: Shooter · RPG · Action

Fallout 4
Shared: RPG · Shooter · Adventure

Vampire Survivors
Shared: Bullet Hell · Arcade · RPG

Halo: Spartan Assault
Shared: Top-Down Shooter · Shooter · Arcade

Wolcen: Lords of Mayhem
Shared: RPG · Action · Adventure

Deathtrap
Shared: RPG · Tower Defense · Action

Clair Obscur: Expedition 33
Shared: RPG · Fantasy · 3D