Games like Malleus
Games like Malleus include Vampire Survivors, Buckshot Roulette, CloverPit, Megabonk, and MUSYNX. We matched them by the tags players give Malleus on Steam (Roguelite, 3D, Singleplayer, Indie, and Arcade): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Roguelite · Indie · Singleplayer

Buckshot Roulette
Shared: Dark · Singleplayer · First-Person

CloverPit
Shared: Roguelite · 3D · First-Person

Megabonk
Shared: Roguelite · Indie · Singleplayer

MUSYNX
Shared: Singleplayer · Indie · 3D

Yet Another Zombie Survivors
Shared: Roguelite · Indie · Singleplayer

Bills Must Be Paid
Shared: Roguelite · Indie · Arcade

Hades
Shared: Roguelite · Indie · Singleplayer

Poppy Playtime
Shared: Singleplayer · First-Person · Dark

Garten of Banban
Shared: Singleplayer · First-Person · 3D

Liars Bar
Shared: Indie · Casual · 3D

Berry Bury Berry
Shared: 3D · Singleplayer · First-Person

Blue Prince
Shared: Roguelite · Singleplayer · Indie

ForgeTax
Shared: Roguelite · Casual · 3D

Five Nights at Freddy's
Shared: Singleplayer · Indie · First-Person

Five Nights at Freddy's: Security Breach
Shared: Singleplayer · First-Person · 3D

Slime Rancher 2
Shared: Singleplayer · First-Person · 3D

Choo-Choo Charles
Shared: Singleplayer · First-Person · 3D

Rogue Legacy 2
Shared: Arcade · Roguelite · Indie

Balatro
Shared: Singleplayer · Roguelite · Indie

The Binding of Isaac: Rebirth
Shared: Indie · Singleplayer · Dark

VHOLUME
Shared: First-Person · 3D · Arcade

Goobies
Shared: Roguelite · 3D · Singleplayer

Internet Cafe Simulator 2
Shared: 3D · First-Person · Singleplayer