Games like Magus Day
Games like Magus Day include Vampire Survivors, Megabonk, Risk of Rain 2, Brotato, and Skul: The Hero Slayer. We matched them by the tags players give Magus Day on Steam (Action, Casual, Action Roguelike, Arcade, and Roguelike): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Roguelite · 2D

Megabonk
Shared: Action Roguelike · Roguelike · Roguelite

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

Brotato
Shared: Roguelike · Action Roguelike · Singleplayer

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

Rogue Legacy
Shared: Action · Action Roguelike · Roguelike

Hades
Shared: Action Roguelike · Action · Roguelite

Gunfire Reborn
Shared: Roguelike · Roguelite · Action

BALL x PIT
Shared: Action · Arcade · Roguelite

Ravenswatch
Shared: Action Roguelike · Action · Roguelike

The Spell Brigade
Shared: Action Roguelike · Roguelite · Roguelike

Halls of Torment
Shared: Action Roguelike · Roguelite · Action

Death Must Die
Shared: Action Roguelike · Roguelite · Action

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

Sephiria
Shared: Action Roguelike · Roguelike · Roguelite

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

Boneraiser Minions
Shared: Action Roguelike · Roguelite · 2D

Hades II
Shared: Action · Roguelike · Action Roguelike

Risk of Rain Returns
Shared: Action Roguelike · Action · 2D

Crab Champions
Shared: Action Roguelike · Roguelike · Arcade

Soulstone Survivors
Shared: Action Roguelike · Roguelite · Roguelike

Dungreed
Shared: Action Roguelike · Action · Roguelike

Streets of Rogue
Shared: Action Roguelike · Roguelite · Action

Dead Cells
Shared: Action Roguelike · Roguelike · Roguelite