Games like Subject: Relictus
Games like Subject: Relictus include Dead Cells, Anomaly Agent, Caveblazers, Skul: The Hero Slayer, and 30XX. We matched them by the tags players give Subject: Relictus on Steam (Action Roguelike, 2D Platformer, Roguelite, Perma Death, and PvE): closest matches first, and among equally close ones the better-known games.

Dead Cells
Shared: Action Roguelike · Roguelite · Roguelike

Anomaly Agent
Shared: 2D Platformer · Action Roguelike · Platformer

Caveblazers
Shared: Action Roguelike · Roguelite · 2D Platformer

Skul: The Hero Slayer
Shared: Action Roguelike · Roguelite · Roguelike

30XX
Shared: Action Roguelike · 2D Platformer · Roguelite

暖雪 Warm Snow
Shared: Action Roguelike · Roguelite · Roguelike

Vampire Survivors
Shared: Action Roguelike · Roguelite · 2D

Risk of Rain (2013)
Shared: Action Roguelike · Platformer · Roguelike

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

Hades
Shared: Action Roguelike · Roguelite · Roguelike

Rogue Legacy
Shared: Action Roguelike · Platformer · Roguelike

Noita
Shared: Roguelike · Action Roguelike · Perma Death

Chinese Online Game
Shared: Action Roguelike · 2D Platformer · Roguelite

BlazBlue Entropy Effect
Shared: Action Roguelike · Platformer · 2D

Risk of Rain 2
Shared: Action Roguelike · Roguelite · Roguelike

Death Must Die
Shared: Action Roguelike · Roguelite · Roguelike

Hades II
Shared: Roguelite · Action Roguelike · Roguelike

Portal Dungeon
Shared: Action Roguelike · Roguelite · PvE

Dungreed
Shared: Action Roguelike · Roguelite · Roguelike

Blade Assault
Shared: 2D Platformer · Platformer · Roguelite

20XX
Shared: Action Roguelike · 2D Platformer · Platformer

SULFUR
Shared: Action Roguelike · Roguelite · Shooter

SYNTHETIK 2
Shared: Action Roguelike · Roguelite · Perma Death

Nova Drift
Shared: Roguelite · Action Roguelike · Action RPG