Games like IRIDESCENT
Games like IRIDESCENT include Risk of Rain 2, LORT, Hades, Megabonk, and Hades II. We matched them by the tags players give IRIDESCENT on Steam (Action Roguelike, Time Management, Third-Person Shooter, Flight, and Roguelite): closest matches first, and among equally close ones the better-known games.

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

LORT
Shared: Action Roguelike · Third-Person Shooter · Roguelite

Hades
Shared: Action Roguelike · Roguelite · Roguelike

Megabonk
Shared: Action Roguelike · Roguelite · Roguelike

Hades II
Shared: Action Roguelike · Roguelite · Roguelike

Soulstone Survivors
Shared: Action Roguelike · Roguelite · Action RPG

Crab Champions
Shared: Action Roguelike · Third-Person Shooter · Roguelike

Vampire Survivors
Shared: Action Roguelike · Roguelite · Roguelike

Shape of Dreams
Shared: Action Roguelike · PvE · Roguelite

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

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

Death Must Die
Shared: Action Roguelike · Roguelite · Roguelike

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

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Roguelike · Indie

Touhou Dystopian
Shared: Action Roguelike · Roguelite · 3D

ELDEN RING NIGHTREIGN
Shared: Roguelike · PvE · Roguelite

Sephiria
Shared: Action Roguelike · Roguelite · Roguelike

The Binding of Isaac
Shared: Action Roguelike · Roguelike · Indie

Vellum
Shared: Action Roguelike · Third-Person Shooter · Roguelite

Terminull Brigade™
Shared: Action Roguelike · Third-Person Shooter · PvE

Jotunnslayer: Hordes of Hel
Shared: Action Roguelike · Roguelite · Action RPG

Fictorum
Shared: Action Roguelike · Third-Person Shooter · Roguelite

Yet Another Zombie Survivors
Shared: Action Roguelike · Roguelite · Action RPG

Moonlighter
Shared: Action Roguelike · Roguelite · Roguelike