Games like Nine Minute Mayhem
Games like Nine Minute Mayhem include Vampire Survivors, Halls of Torment, Death Must Die, 暖雪 Warm Snow, and SYNTHETIK 2. We matched them by the tags players give Nine Minute Mayhem on Steam (Action Roguelike, Twin Stick Shooter, Roguelite, PvE, and Shooter): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Roguelite · 2D

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

Death Must Die
Shared: Action Roguelike · Roguelite · RPG

暖雪 Warm Snow
Shared: Action Roguelike · Roguelite · 2D

SYNTHETIK 2
Shared: Action Roguelike · Roguelite · Twin Stick Shooter

Hero Siege
Shared: Action Roguelike · Action RPG · RPG

Heroes of Hammerwatch II
Shared: Action Roguelike · Action RPG · RPG

Hades
Shared: Action Roguelike · Roguelite · Indie

Shape of Dreams
Shared: Action Roguelike · PvE · Roguelite

Soulstone Survivors
Shared: Action Roguelike · Roguelite · Action RPG

UnderMine
Shared: Action Roguelike · Roguelite · RPG

Rogue: Genesia
Shared: Action Roguelike · Roguelite · Twin Stick Shooter

Enter the Gungeon
Shared: Action Roguelike · Twin Stick Shooter · Pixel Graphics

Hades II
Shared: Roguelite · Action Roguelike · Action

Witchfire
Shared: Roguelite · Shooter · PvE

Blazing Beaks
Shared: Action Roguelike · Roguelite · Shooter

Revita
Shared: Action Roguelike · Twin Stick Shooter · Roguelite

Skul: The Hero Slayer
Shared: Action Roguelike · Roguelite · 2D

Nuclear Throne
Shared: Action Roguelike · Roguelite · Indie

Sephiria
Shared: Action Roguelike · Roguelite · RPG

SNKRX
Shared: Action Roguelike · Roguelite · Shooter

SYNTHETIK: Legion Rising
Shared: Roguelite · Action Roguelike · Twin Stick Shooter

Moonlighter
Shared: Roguelite · Action Roguelike · Action RPG

Nordic Ashes: Survivors of Ragnarok
Shared: Action Roguelike · Roguelite · Action RPG