Games like Thunder Infinity
Games like Thunder Infinity include Bit Blaster XL, Nova Drift, Planes, Bullets and Vodka, BALL x PIT, and Ikaruga. We matched them by the tags players give Thunder Infinity on Steam (Boomer Shooter, Bullet Hell, Shoot 'Em Up, Action, and Shooter): closest matches first, and among equally close ones the better-known games.

Bit Blaster XL
Shared: Bullet Hell · Shoot 'Em Up · Shooter

Nova Drift
Shared: Bullet Hell · Shoot 'Em Up · Arcade

Planes, Bullets and Vodka
Shared: Shoot 'Em Up · Action · Bullet Hell

BALL x PIT
Shared: Action · Bullet Hell · Arcade

Ikaruga
Shared: Bullet Hell · Shoot 'Em Up · Action

DoDonPachi Resurrection
Shared: Bullet Hell · Shoot 'Em Up · Shooter

LUFTRAUSERS
Shared: Bullet Hell · Action · Arcade

ZeroRanger
Shared: Shoot 'Em Up · Bullet Hell · Action

Mushihimesama
Shared: Bullet Hell · Shoot 'Em Up · Action

Revolution Ace
Shared: Shoot 'Em Up · Bullet Hell · Action

Warhammer 40,000: Boltgun
Shared: Boomer Shooter · Shooter · Action

Star Saviors
Shared: Bullet Hell · Shoot 'Em Up · Action

DRAINUS
Shared: Shoot 'Em Up · Action · Shooter

Dimension Tripper Neptune: TOP NEP
Shared: Action · Bullet Hell · Shoot 'Em Up

BLUE REVOLVER
Shared: Bullet Hell · Shoot 'Em Up · Action

Touhou Kinjoukyou ~ Fossilized Wonders.
Shared: Bullet Hell · Shoot 'Em Up · Action

POSTAL: Brain Damaged
Shared: Boomer Shooter · Action · Shooter

Neptunia Shooter
Shared: Bullet Hell · Shoot 'Em Up · Action

Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Bullet Hell · Shoot 'Em Up · Action

METAL SLUG
Shared: Action · Arcade · Shoot 'Em Up

Waves
Shared: Bullet Hell · Shoot 'Em Up · Shooter

Sky Force Reloaded
Shared: Shoot 'Em Up · Bullet Hell · Arcade

Touhou Kouryudou ~ Unconnected Marketeers.
Shared: Bullet Hell · Shoot 'Em Up · Action

Beat Hazard
Shared: Bullet Hell · Shoot 'Em Up · Action