Games like Magnificent-1
Games like Magnificent-1 include Vampire Survivors, BALL x PIT, LUFTRAUSERS, Hotline Miami, and Exit the Gungeon. We matched them by the tags players give Magnificent-1 on Steam (Action, Indie, Arcade, Bullet Hell, and Top-Down Shooter): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Indie · Pixel Graphics

BALL x PIT
Shared: Action · Arcade · Bullet Hell

LUFTRAUSERS
Shared: Indie · Action · Arcade

Hotline Miami
Shared: Action · Indie · Pixel Graphics

Exit the Gungeon
Shared: Indie · Action · Arcade

Nuclear Throne
Shared: Indie · Action · Bullet Hell

Halls of Torment
Shared: Bullet Hell · Action · Pixel Graphics

Cyberhunt
Shared: Action · Indie · Arcade

Enter the Gungeon
Shared: Bullet Hell · Indie · Pixel Graphics

Hotline Miami 2: Wrong Number
Shared: Action · Pixel Graphics · Indie

UBERMOSH Vol.3
Shared: Action · Indie · Arcade

UBERMOSH
Shared: Action · Indie · Arcade

Project Wingman
Shared: Action · Indie · Arcade

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

UBERMOSH Vol.5
Shared: Action · Indie · Arcade

ZeroRanger
Shared: Indie · Action · Bullet Hell

Sky Force Reloaded
Shared: Arcade · Bullet Hell · Action

Broforce
Shared: Action · Pixel Graphics · 2D

Megabonk
Shared: Indie · Bullet Hell · Action

UFO 50
Shared: Indie · Action · Arcade

UBERMOSH:BLACK
Shared: Action · Indie · Arcade

Timberman
Shared: Indie · Action · Pixel Graphics

Windowkill
Shared: Action · Indie · Bullet Hell

Planes, Bullets and Vodka
Shared: Action · Bullet Hell · Arcade