Games like Survivor Squad
Games like Survivor Squad include Project Zomboid, Plague Inc: Evolved, The Escapists, Days Gone, and 7 Days to Die. We matched them by the tags players give Survivor Squad on Steam (Strategy, Indie, Zombies, Action, and Survival): closest matches first, and among equally close ones the better-known games.

Project Zomboid
Shared: Zombies · Survival · Multiplayer

Plague Inc: Evolved
Shared: Strategy · Indie · Zombies

The Escapists
Shared: Strategy · Indie · Action

Days Gone
Shared: Zombies · Survival · Singleplayer

7 Days to Die
Shared: Zombies · Survival · Multiplayer

Left 4 Dead 2
Shared: Zombies · Action · Multiplayer

Miscreated
Shared: Survival · Zombies · Multiplayer

Terraria
Shared: Survival · Multiplayer · Crafting

Don't Starve Together
Shared: Survival · Multiplayer · Indie

DayZ
Shared: Zombies · Survival · Multiplayer

Rust
Shared: Survival · Multiplayer · Crafting

Green Hell
Shared: Survival · Multiplayer · Action

Plants vs. Zombies GOTY Edition
Shared: Strategy · Zombies · Singleplayer

Don't Starve
Shared: Survival · Indie · Crafting

Survivalist
Shared: Zombies · Survival · Strategy

SCUM
Shared: Survival · Zombies · Action

Door Kickers
Shared: Strategy · Indie · Action

DeadPoly
Shared: Zombies · Survival · Multiplayer

Infection Free Zone
Shared: Zombies · Strategy · Survival

How to Survive
Shared: Zombies · Survival · Action

This War of Mine
Shared: Strategy · Survival · Singleplayer

Deadlight
Shared: Zombies · Indie · Action

State of Decay: YOSE
Shared: Zombies · Survival · Action

Left 4 Dead
Shared: Zombies · Action · Multiplayer