Games like Zodiac - Hellish Memory
Games like Zodiac - Hellish Memory include Bit Blaster XL, Baba Is You, Enter the Gungeon, Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil, and Vampire Survivors. We matched them by the tags players give Zodiac - Hellish Memory on Steam (Bullet Hell, Puzzle, PvE, Difficult, and Shooter): closest matches first, and among equally close ones the better-known games.

Bit Blaster XL
Shared: Bullet Hell · Difficult · Shooter

Baba Is You
Shared: Puzzle · Difficult · Singleplayer

Enter the Gungeon
Shared: Bullet Hell · Difficult · 2D

Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Bullet Hell · Difficult · Action

Vampire Survivors
Shared: Bullet Hell · 2D · Singleplayer

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

Zup! S
Shared: Puzzle · 2D · Singleplayer

Cuphead
Shared: Difficult · 2D · Bullet Hell

Touhou Tenkuushou ~ Hidden Star in Four Seasons.
Shared: Bullet Hell · Difficult · Singleplayer

Touhou Kouryudou ~ Unconnected Marketeers.
Shared: Bullet Hell · Action · Shooter

LUFTRAUSERS
Shared: Bullet Hell · Action · 2D

Star of Providence
Shared: Bullet Hell · Difficult · Action

SUPERHOT
Shared: Action · Puzzle · Shooter

Defy Gravity Extended
Shared: Puzzle · 2D · Difficult

Rabbit and Steel
Shared: Bullet Hell · Difficult · 2D

HELLDIVERS™ 2
Shared: PvE · Shooter · Action

Just Shapes & Beats
Shared: Bullet Hell · Difficult · 2D

Changed
Shared: Difficult · Puzzle · Singleplayer

BEEP
Shared: Puzzle · 2D · Singleplayer

Nuclear Throne
Shared: Bullet Hell · Difficult · Action

Hollow Knight: Silksong
Shared: Difficult · 2D · Singleplayer

Touhou Juuouen 〜 Unfinished Dream of All Living Ghost.
Shared: Bullet Hell · Action · Shooter

Revolution Ace
Shared: Bullet Hell · Action · Shooter

Exit the Gungeon
Shared: Bullet Hell · Action · 2D