Games like Girl Agent
Games like Girl Agent include SYNTHETIK: Legion Rising, Bright Memory: Infinite, Tomb Raider Game of the Year, BALL x PIT, and Hades II. We matched them by the tags players give Girl Agent on Steam (Top-Down Shooter, Female Protagonist, Shoot 'Em Up, Shooter, and Action): closest matches first, and among equally close ones the better-known games.

SYNTHETIK: Legion Rising
Shared: Top-Down Shooter · Action · Indie

Bright Memory: Infinite
Shared: Female Protagonist · Action · Shooter

Tomb Raider Game of the Year
Shared: Female Protagonist · Action · Third Person

BALL x PIT
Shared: Action · Top-Down Shooter · Shoot 'Em Up

Hades II
Shared: Action · Female Protagonist · Roguelike

Rise of the Tomb Raider™
Shared: Female Protagonist · Action · Third Person

20 Minutes Till Dawn
Shared: Top-Down Shooter · Shoot 'Em Up · Roguelite

Stellar Blade™
Shared: Female Protagonist · Action · Third Person

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

Hades
Shared: Action · Indie · Roguelite

Nuclear Throne
Shared: Top-Down Shooter · Action · Indie

Risk of Rain 2
Shared: Action · Shooter · Roguelike

Bright Memory
Shared: Female Protagonist · Shooter · Action

Grand Theft Auto V Legacy
Shared: Action · Shooter · Third Person

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

SNKRX
Shared: Top-Down Shooter · Shoot 'Em Up · Shooter

Escape From Duckov
Shared: Top-Down Shooter · Action · Shooter

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

Nova Drift
Shared: Shoot 'Em Up · Shooter · Action

DRAINUS
Shared: Shoot 'Em Up · Action · Shooter

Black Market of Bulletphilia ~ 100th Black Market.
Shared: Female Protagonist · Shoot 'Em Up · Shooter

Touhou Dystopian
Shared: Female Protagonist · Action · Third Person

12 is Better Than 6
Shared: Top-Down Shooter · Shooter · Action

Multi Turret Academy
Shared: Top-Down Shooter · Shooter · Shoot 'Em Up