Games like Undercover Agent
Games like Undercover Agent include The Life and Suffering of Sir Brante, Roadwarden, To the Moon, Suzerain, and Choice of Robots. We matched them by the tags players give Undercover Agent on Steam (Espionage, Interactive Fiction, Adventure, RPG, and Indie): closest matches first, and among equally close ones the better-known games.

The Life and Suffering of Sir Brante
Shared: Interactive Fiction · RPG · Choices Matter

Roadwarden
Shared: RPG · Adventure · Interactive Fiction

To the Moon
Shared: Indie · Adventure · Interactive Fiction

Suzerain
Shared: Interactive Fiction · Choose Your Own Adventure · Choices Matter

Choice of Robots
Shared: Interactive Fiction · Text-Based · Choose Your Own Adventure

Baldur's Gate 3
Shared: RPG · Choices Matter · Adventure

The Witcher 3: Wild Hunt — Remastered
Shared: RPG · Adventure · Choices Matter

Wayhaven Chronicles: Book One
Shared: RPG · Adventure · Indie

Fallen Hero: Rebirth
Shared: Adventure · Indie · Text-Based

Late Shift
Shared: Interactive Fiction · Choices Matter · Adventure

Sorcery! Parts 1 and 2
Shared: Adventure · RPG · Interactive Fiction

Love Is All Around
Shared: Interactive Fiction · Choices Matter · Romance

Road to Empress Ⅱ
Shared: Adventure · Interactive Fiction · Choices Matter

Florence
Shared: Adventure · Indie · Interactive Fiction

Far Away
Shared: Choices Matter · Choose Your Own Adventure · Adventure

Road to Empress I
Shared: RPG · Choices Matter · Adventure

Yes, Your Grace
Shared: Indie · RPG · Choices Matter

Finding Paradise
Shared: Adventure · RPG · Interactive Fiction

Esoteric Ebb
Shared: RPG · Interactive Fiction · Choices Matter

WILL: A Wonderful World / WILL:美好世界
Shared: RPG · Adventure · Indie

Slay the Princess — The Pristine Cut
Shared: Choices Matter · Choose Your Own Adventure · Interactive Fiction

Sultan's Game
Shared: RPG · Adventure · Story Rich

A Bird Story
Shared: Indie · Adventure · Interactive Fiction

Life is Strange: True Colors
Shared: Choices Matter · Choose Your Own Adventure · Adventure