Games like The 7th Sign Project
Games like The 7th Sign Project include Broforce, Huntdown, SANABI, Contra: Operation Galuga, and My Friend Pedro. We matched them by the tags players give The 7th Sign Project on Steam (Action, Platformer, Shooter, 2D Platformer, and Bullet Hell): closest matches first, and among equally close ones the better-known games.

Broforce
Shared: Action · Platformer · 2D

Huntdown
Shared: Action · Shooter · Side Scroller

SANABI
Shared: Action · 2D Platformer · Platformer

Contra: Operation Galuga
Shared: Action · Shooter · Platformer

My Friend Pedro
Shared: Action · Shooter · Platformer

Cuphead
Shared: Platformer · 2D · Bullet Hell

Mark of the Ninja
Shared: Platformer · Action · 2D

Katana ZERO
Shared: Action · Platformer · 2D Platformer

Brawlhalla
Shared: 2D Platformer · Platformer · Action

Contra Anniversary Collection
Shared: Action · Platformer · Side Scroller

Zombotron
Shared: Action · Shooter · 2D

Alex Jones: NWO Wars
Shared: Action · Shooter · 2D Platformer

Intrusion 2
Shared: Action · Platformer · Shooter

Guns, Gore & Cannoli
Shared: Action · Side Scroller · 2D

Super Meat Boy
Shared: Platformer · 2D Platformer · 2D

Gravity Circuit
Shared: Action · Platformer · 2D Platformer

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

LIMBO
Shared: Platformer · 2D · Atmospheric

Pizza Tower
Shared: 2D Platformer · Platformer · Action

UDONGEIN X
Shared: Action · Platformer · 2D Platformer

Hollow Knight
Shared: Platformer · 2D · Atmospheric

NINJA GAIDEN: Ragebound
Shared: Action · Platformer · 2D Platformer

METAL SLUG
Shared: Action · Side Scroller · 2D

Terminator 2D: NO FATE
Shared: 2D Platformer · Action · Side Scroller