Games like SenpaiSurvivor
Games like SenpaiSurvivor include Left 4 Dead 2, Call of Duty®: Black Ops III, KovaaK's, Mirror 2: Project X, and Half-Life 2. We matched them by the tags players give SenpaiSurvivor on Steam (Action, Casual, FPS, Anime, and 3D): closest matches first, and among equally close ones the better-known games.

Left 4 Dead 2
Shared: FPS · Zombies · Action

Call of Duty®: Black Ops III
Shared: FPS · Action · Zombies

KovaaK's
Shared: Action · FPS · Shooter

Mirror 2: Project X
Shared: 3D · Anime · FPS

Half-Life 2
Shared: Action · FPS · Singleplayer

Dead Bits
Shared: Action · Casual · FPS

Call of Duty®: Black Ops
Shared: Action · FPS · Zombies

Black Mesa
Shared: Action · FPS · Singleplayer

Call of Duty®: Modern Warfare® 3 (2011)
Shared: Action · FPS · Shooter

Call of Duty®
Shared: FPS · Action · Singleplayer

Aimlabs
Shared: FPS · Action · Shooter

SUPERHOT
Shared: Action · FPS · Indie

Call of Duty: World at War
Shared: FPS · Action · Zombies

Neon White
Shared: FPS · Action · Anime

Resident Evil Requiem
Shared: Action · Zombies · FPS

DOOM
Shared: Action · FPS · Shooter

Bright Memory: Infinite
Shared: Action · FPS · Indie

Battlefield™ 2042
Shared: FPS · Action · Shooter

MULLET MADJACK
Shared: FPS · Action · Anime

Call of Duty®: Modern Warfare® Remastered (2017)
Shared: FPS · Action · Singleplayer

Call of Duty®: Black Ops Cold War
Shared: FPS · Action · Zombies

Left 4 Dead
Shared: Action · FPS · Zombies

Battlefield™ 6
Shared: FPS · Action · Singleplayer

BioShock Infinite
Shared: Action · FPS · Shooter