Games like Collector Thief
Games like Collector Thief include Shadow Tactics: Blades of the Shogun, Orcs Must Die!, Librarian: Tidy Up the Arcane Library!, Secret of the Magic Crystals, and Bloons TD 6. We matched them by the tags players give Collector Thief on Steam (Strategy, Time Management, Collectathon, Hidden Object, and Action-Adventure): closest matches first, and among equally close ones the better-known games.

Shadow Tactics: Blades of the Shogun
Shared: Strategy · Stealth · Indie

Orcs Must Die!
Shared: Strategy · Third Person · Indie

Librarian: Tidy Up the Arcane Library!
Shared: Collectathon · Hidden Object · 3D

Secret of the Magic Crystals
Shared: Time Management · Strategy · Action-Adventure

Bloons TD 6
Shared: Strategy · 3D · Singleplayer

Totally Accurate Battle Simulator
Shared: Strategy · Indie · 3D

The WereCleaner
Shared: Strategy · Stealth · Action-Adventure

Aragami 2
Shared: Action-Adventure · Stealth · Third Person

Assassin’s Creed Shadows
Shared: Action-Adventure · 3D · Stealth

Ninja Stealth
Shared: Strategy · Action-Adventure · Stealth

Buckshot Roulette
Shared: Strategy · 3D · Indie

Wildmender
Shared: Strategy · 3D · Third Person

Orcs Must Die! 3
Shared: Strategy · Third Person · 3D

Papa's Freezeria Deluxe
Shared: Time Management · Strategy · Indie

The Alters
Shared: Strategy · Action-Adventure · Third Person

Influent Language Learning Game
Shared: 3D · Hidden Object · Collectathon

Pumpkin Jack
Shared: Collectathon · Third Person · Indie

Assassin's Creed® Origins
Shared: Action-Adventure · Third Person · Stealth

Desperados III
Shared: Strategy · Stealth · Third Person

Gunpoint
Shared: Strategy · Indie · Stealth

Ninja Stealth 2
Shared: Strategy · Action-Adventure · Stealth

Cairn
Shared: Stylized · Indie · Action-Adventure

Tavern Master
Shared: Strategy · Time Management · Indie

WEBFISHING
Shared: 3D · Collectathon · Indie