Games like 城塞騎士/Jousai-kishi
Games like 城塞騎士/Jousai-kishi include Vampire Survivors, Skul: The Hero Slayer, Hotline Miami, Timberman, and Dungreed. We matched them by the tags players give 城塞騎士/Jousai-kishi on Steam (Action, Tower Defense, Roguelite, 2D, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Roguelite · Pixel Graphics · 2D

Skul: The Hero Slayer
Shared: Action · Pixel Graphics · 2D

Hotline Miami
Shared: Action · Pixel Graphics · Indie

Timberman
Shared: Action · Pixel Graphics · Casual

Dungreed
Shared: Action · Roguelite · Pixel Graphics

Kingdom Rush - Tower Defense
Shared: Tower Defense · 2D · Action

BALL x PIT
Shared: Action · Roguelite · Pixel Graphics

Death Must Die
Shared: Roguelite · Pixel Graphics · Action

Broforce
Shared: Action · Pixel Graphics · 2D

Megabonk
Shared: Roguelite · Action · Indie

SANABI
Shared: Action · Pixel Graphics · 2D

Boneraiser Minions
Shared: Roguelite · Pixel Graphics · 2D

Wall World
Shared: Roguelite · Tower Defense · Pixel Graphics

UnderMine
Shared: Roguelite · Pixel Graphics · Action

Rogue Legacy
Shared: Action · 2D · Indie

Plants vs. Zombies GOTY Edition
Shared: Tower Defense · 2D · Casual

Dead Cells
Shared: Pixel Graphics · 2D · Roguelite

Katana ZERO
Shared: Action · Pixel Graphics · 2D

UFO 50
Shared: Action · Pixel Graphics · 2D

Hades
Shared: Roguelite · Action · Indie

Forager
Shared: Pixel Graphics · 2D · Indie

Kingdom Rush Origins - Tower Defense
Shared: Tower Defense · 2D · Casual

Rock 'N' Roll Defense
Shared: Tower Defense · Action · Casual

Hotline Miami 2: Wrong Number
Shared: Action · Pixel Graphics · 1980s