Games like Thief's Adventure
Games like Thief's Adventure include Aliens: Dark Descent, Kingdom Rush - Tower Defense, Party Hard, Shadow Tactics: Blades of the Shogun, and Desperados III. We matched them by the tags players give Thief's Adventure on Steam (Action, Real Time Tactics, Stealth, Strategy, and Action-Adventure): closest matches first, and among equally close ones the better-known games.

Aliens: Dark Descent
Shared: Action · Strategy · Real Time Tactics

Kingdom Rush - Tower Defense
Shared: Strategy · Action · 2D

Party Hard
Shared: Stealth · Strategy · Action

Shadow Tactics: Blades of the Shogun
Shared: Stealth · Strategy · Real Time Tactics

Desperados III
Shared: Real Time Tactics · Stealth · Strategy

Gunpoint
Shared: Stealth · Action · 2D

The Escapists
Shared: Strategy · Action · Pixel Graphics

Total War: WARHAMMER III
Shared: Strategy · Real Time Tactics · Action

Door Kickers
Shared: Strategy · Action · Top-Down

Kingdom Rush Vengeance - Tower Defense
Shared: Strategy · 2D · Action

Total War: WARHAMMER II
Shared: Strategy · Action · Fantasy

Kingdom Rush Origins - Tower Defense
Shared: Strategy · 2D · Singleplayer

Crimson Desert Enhanced
Shared: Action · Singleplayer · Action-Adventure

SANABI
Shared: Action · Pixel Graphics · 2D

Mina the Hollower
Shared: Action-Adventure · Top-Down · Pixel Graphics

BlazBlue Entropy Effect
Shared: Action · 2D · Action-Adventure

Middle-earth: Shadow of War
Shared: Action · Stealth · Fantasy

Skul: The Hero Slayer
Shared: Action · 2D · Pixel Graphics

DEADBOLT
Shared: Stealth · Action · Pixel Graphics

Shadow Tactics: Aiko's Choice
Shared: Real Time Tactics · Strategy · Action

Heat Signature
Shared: Stealth · Action · Strategy

Kingdom Rush 6: Genesis TD
Shared: Action · Strategy · 2D

Kingdom Rush 5: Alliance TD
Shared: Strategy · 2D · Singleplayer

Mount & Blade II: Bannerlord
Shared: Strategy · Action · Medieval