Games like Thunder Kid
Games like Thunder Kid include ZeroRanger, Intrusion 2, Bit Blaster XL, Cuphead, and Broforce. We matched them by the tags players give Thunder Kid on Steam (Action, Shoot 'Em Up, Indie, Sci-fi, and Retro): closest matches first, and among equally close ones the better-known games.

ZeroRanger
Shared: Shoot 'Em Up · Indie · Action

Intrusion 2
Shared: Action · Indie · Platformer

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

Cuphead
Shared: Platformer · Indie · Difficult

Broforce
Shared: Action · Indie · Platformer

LUFTRAUSERS
Shared: Indie · Action · Shoot 'Em Up

Out There Somewhere
Shared: Indie · Platformer · Action

Shovel Knight: Treasure Trove
Shared: Platformer · Indie · Retro

Huntdown
Shared: Action · Shoot 'Em Up · Shooter

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

Axiom Verge
Shared: Indie · Action · Platformer

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

DEVIL BLADE REBOOT
Shared: Shoot 'Em Up · Action · Shooter

Blazing Chrome
Shared: Action · Retro · Indie

Hotline Miami
Shared: Action · Indie · Retro

Katana ZERO
Shared: Action · Platformer · Indie

DRAINUS
Shared: Action · Shoot 'Em Up · Indie

Revolution Ace
Shared: Action · Shoot 'Em Up · Indie

Star Saviors
Shared: Shoot 'Em Up · Action · Indie

Valfaris
Shared: Action · Indie · Platformer

Zombotron
Shared: Action · Indie · Sci-fi

Skul: The Hero Slayer
Shared: Action · Indie · Platformer

Devil Daggers
Shared: Indie · Action · Retro

Star of Providence
Shared: Shoot 'Em Up · Indie · Action