Games like Grail to the Thief
Games like Grail to the Thief include Florence, Roadwarden, There Is No Game: Wrong Dimension, The Life and Suffering of Sir Brante, and To the Moon. We matched them by the tags players give Grail to the Thief on Steam (Adventure, Indie, Casual, Choose Your Own Adventure, and Interactive Fiction): closest matches first, and among equally close ones the better-known games.

Florence
Shared: Indie · Adventure · Casual

Roadwarden
Shared: Adventure · Indie · Text-Based

There Is No Game: Wrong Dimension
Shared: Indie · Adventure · Casual

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

To the Moon
Shared: Indie · Adventure · Interactive Fiction

Choice of Robots
Shared: Choose Your Own Adventure · Indie · Interactive Fiction

Pikuniku
Shared: Adventure · Indie · Casual

The Great Perhaps
Shared: Adventure · Indie · Casual

Fallen Hero: Retribution
Shared: Casual · Adventure · Indie

Vampire: The Masquerade — Parliament of Knives
Shared: Indie · Adventure · Casual

Suzerain
Shared: Choose Your Own Adventure · Interactive Fiction · Text-Based

Late Shift
Shared: Choose Your Own Adventure · Adventure · Interactive Fiction

Vampires' Melody
Shared: Adventure · Casual · Interactive Fiction

Omen Exitio: Plague
Shared: Indie · Adventure · Interactive Fiction

Donut County
Shared: Indie · Casual · Adventure

80 Days
Shared: Adventure · Choose Your Own Adventure · Indie

Wayhaven Chronicles: Book Two
Shared: Indie · Adventure · Casual

Impossible Quest
Shared: Indie · Adventure · Casual

Refind Self: The Personality Test Game
Shared: Adventure · Interactive Fiction · Choose Your Own Adventure

SPACEPLAN
Shared: Indie · Casual · Adventure

Sorcery! Parts 1 and 2
Shared: Adventure · Choose Your Own Adventure · Indie

Chained Together
Shared: Adventure · Casual · Indie

Vampire: The Masquerade — Night Road
Shared: Choose Your Own Adventure · Interactive Fiction · Text-Based

Melvor Idle
Shared: Casual · Indie · Adventure