Games like Train Survivor
Games like Train Survivor include Yet Another Zombie Survivors, Megabonk, Deep Rock Galactic: Survivor, 20 Minutes Till Dawn, and The Last Stand: Aftermath. We matched them by the tags players give Train Survivor on Steam (Action Roguelike, Bullet Heaven, Top-Down Shooter, Shooter, and 3D): closest matches first, and among equally close ones the better-known games.

Yet Another Zombie Survivors
Shared: Bullet Heaven · Action Roguelike · Top-Down Shooter

Megabonk
Shared: Action Roguelike · Bullet Heaven · Action

Deep Rock Galactic: Survivor
Shared: Action Roguelike · Bullet Heaven · Top-Down Shooter

20 Minutes Till Dawn
Shared: Action Roguelike · Top-Down Shooter · Bullet Heaven

The Last Stand: Aftermath
Shared: Top-Down Shooter · Action Roguelike · Shooter

Arms of God
Shared: Action Roguelike · Bullet Heaven · Top-Down Shooter

The Spell Brigade
Shared: Bullet Heaven · Action Roguelike · Top-Down Shooter

Army of Ruin
Shared: Action Roguelike · Top-Down Shooter · Shooter

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

Soulstone Survivors
Shared: Action Roguelike · Bullet Heaven · Action

Brotato
Shared: Action Roguelike · Bullet Heaven · Top-Down Shooter

Zombieville USA 3D
Shared: Top-Down Shooter · Action Roguelike · Shooter

Pathogenic
Shared: Top-Down Shooter · Bullet Heaven · Action Roguelike

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

Apocalypse Party
Shared: Action Roguelike · Top-Down Shooter · Casual

Shape of Dreams
Shared: Action Roguelike · Top-Down · 3D

Time Wasters
Shared: Action Roguelike · Bullet Heaven · Controller

Project Lazarus
Shared: Action Roguelike · Bullet Heaven · Action

BALL x PIT
Shared: Action Roguelike · Action · Top-Down Shooter

Goobies
Shared: Action Roguelike · Top-Down Shooter · 3D

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

SYNTHETIK 2
Shared: Action Roguelike · Top-Down Shooter · Shooter

Vital Shell
Shared: Action Roguelike · Bullet Heaven · Top-Down Shooter

Survivors of the Dawn
Shared: Action Roguelike · Bullet Heaven · Top-Down Shooter