Games like Geometric Hell
Games like Geometric Hell include Vampire Survivors, LUFTRAUSERS, Bit Blaster XL, Planes, Bullets and Vodka, and Exit the Gungeon. We matched them by the tags players give Geometric Hell on Steam (Action, Arcade, Bullet Hell, 2D, and Shooter): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · 2D · Singleplayer

LUFTRAUSERS
Shared: Arcade · Bullet Hell · Action

Bit Blaster XL
Shared: Bullet Hell · Arcade · Shooter

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

Exit the Gungeon
Shared: Arcade · Action · Bullet Hell

BALL x PIT
Shared: Action · Arcade · Bullet Hell

Windowkill
Shared: Action · Bullet Hell · Arcade

Battlefield™ 6
Shared: Action · Shooter · Singleplayer

Battlefield™ 2042
Shared: Shooter · Action · Singleplayer

Commando Collection
Shared: Action · Bullet Hell · Arcade

METAL SLUG
Shared: Action · Arcade · 2D

Nova Drift
Shared: Bullet Hell · Arcade · Shooter

METAL SLUG 3
Shared: Arcade · Action · Shooter

Ikaruga
Shared: Arcade · Bullet Hell · Action

Revolution Ace
Shared: Action · Bullet Hell · Arcade

DRAINUS
Shared: Action · Shooter · 2D

Geometry Wars: Retro Evolved
Shared: Arcade · Bullet Hell · 2D

METAL SLUG XX
Shared: Action · 2D · Arcade

Star Saviors
Shared: Action · Bullet Hell · Arcade

METAL SLUG X
Shared: Action · Arcade · 2D

Touhou Kinjoukyou ~ Fossilized Wonders.
Shared: Bullet Hell · Action · Arcade

ZeroRanger
Shared: Bullet Hell · Action · Arcade

Half-Life 2
Shared: Action · Singleplayer · Shooter

BONEWORKS
Shared: Action · Shooter · Physics