Games like 30 days in red army
Games like 30 days in red army include Retirement Simulator, Stardew Valley, Chinese Parents, My Time at Portia, and Volcano Princess. We matched them by the tags players give 30 days in red army on Steam (Casual, Simulation, RPG, Interactive Fiction, and Life Sim): closest matches first, and among equally close ones the better-known games.

Retirement Simulator
Shared: Simulation · RPG · Casual

Stardew Valley
Shared: RPG · Life Sim · Simulation

Chinese Parents
Shared: Simulation · Casual · Life Sim

My Time at Portia
Shared: RPG · Life Sim · Simulation

Volcano Princess
Shared: Life Sim · RPG · Simulation

The Life and Suffering of Sir Brante
Shared: RPG · Interactive Fiction · Choose Your Own Adventure

The Sims™ 3
Shared: Simulation · Life Sim · Casual

Growing Up
Shared: Simulation · Life Sim · RPG

鬼谷八荒 Tale of Immortal
Shared: Simulation · RPG · Choose Your Own Adventure

Reigns
Shared: Life Sim · RPG · Choose Your Own Adventure

Plebby Quest: The Crusades
Shared: Casual · RPG · Simulation

Paralives
Shared: Simulation · Life Sim · Casual

Touhou Mystia's Izakaya
Shared: Casual · Simulation · RPG

Hua Manlou
Shared: Casual · Simulation · RPG

Farmer's Dynasty - Final Harvest Edition
Shared: Simulation · RPG · Life Sim

Streamer Life Simulator
Shared: Simulation · Casual · Life Sim

Starsand Island
Shared: RPG · Casual · Life Sim

Soul Touch
Shared: Interactive Fiction · Choose Your Own Adventure · Casual

Potion Craft: Alchemist Simulator
Shared: Simulation · Casual · RPG

I Am Future: Cozy Apocalypse Survival
Shared: Casual · RPG · Simulation

Emily is Away Too
Shared: Simulation · Casual · Indie

Coral Island
Shared: Simulation · Life Sim · RPG

The Scroll of Taiwu : Beyond The Dome
Shared: RPG · Simulation · Casual

Little Witch in the Woods
Shared: Casual · Simulation · Life Sim