Games like Power Fantasy
Games like Power Fantasy include Death Must Die, Halls of Torment, Vampire Survivors, Megabonk, and Soulstone Survivors. We matched them by the tags players give Power Fantasy on Steam (Bullet Heaven, Free to Play, Action, RPG, and Action Roguelike): closest matches first, and among equally close ones the better-known games.

Death Must Die
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Halls of Torment
Shared: Action Roguelike · Bullet Hell · Action

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Pixel Graphics

Megabonk
Shared: Bullet Heaven · Action Roguelike · Bullet Hell

Soulstone Survivors
Shared: Bullet Heaven · Action Roguelike · Bullet Hell

Brotato
Shared: Bullet Heaven · Action Roguelike · Bullet Hell

Tower of Babel: Survivors of Chaos
Shared: Bullet Heaven · Action Roguelike · Bullet Hell

Enter the Gungeon
Shared: Action Roguelike · Bullet Hell · Pixel Graphics

Hero Siege
Shared: RPG · Action Roguelike · Pixel Graphics

Rogue: Genesia
Shared: Bullet Heaven · Action Roguelike · Bullet Hell

BALL x PIT
Shared: Action · Bullet Hell · Action Roguelike

20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Survival

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Bullet Heaven

Atomicrops
Shared: Action · Bullet Hell · Bullet Heaven

Relic Hunters Zero: Remix
Shared: Action · Twin Stick Shooter · Action Roguelike

Nordic Ashes: Survivors of Ragnarok
Shared: Bullet Heaven · Action Roguelike · Bullet Hell

Warframe
Shared: Free to Play · Action · RPG

Deep Rock Galactic: Survivor
Shared: Bullet Heaven · Action Roguelike · Bullet Hell

Cultivation Story: Reincarnation
Shared: RPG · Action Roguelike · Action

Sephiria
Shared: Action Roguelike · Action · RPG

UnderMine
Shared: Action Roguelike · RPG · Action

Skul: The Hero Slayer
Shared: Action · Action Roguelike · Pixel Graphics

Bloody Hell
Shared: Bullet Hell · Free to Play · Twin Stick Shooter

Spirit Hunters: Infinite Horde
Shared: Bullet Heaven · Action · Action Roguelike