Games like Hexart City
Games like Hexart City include Thronefall, Idle Champions of the Forgotten Realms, Melvor Idle, Cookie Clicker, and ISLANDERS. We matched them by the tags players give Hexart City on Steam (Casual, 3D Platformer, Idler, City Builder, and 3D): closest matches first, and among equally close ones the better-known games.

Thronefall
Shared: City Builder · Strategy · Medieval

Idle Champions of the Forgotten Realms
Shared: Idler · Fantasy · Strategy

Melvor Idle
Shared: Casual · Idler · Indie

Cookie Clicker
Shared: Idler · Casual · Indie

ISLANDERS
Shared: City Builder · Strategy · Indie

Deskrawl: Idle ARPG
Shared: Idler · Casual · 3D

Kingdom Rush - Tower Defense
Shared: Casual · Strategy · Fantasy

Kingdom Two Crowns
Shared: City Builder · Medieval · Fantasy

Bills Must Be Paid
Shared: Idler · Casual · Strategy

A Game About Feeding A Black Hole
Shared: Casual · Idler · Strategy

Bloons TD 6
Shared: Casual · Strategy · 3D

SUMMERHOUSE
Shared: Casual · City Builder · Colorful

Rogue Tower
Shared: Casual · 3D · Strategy

Banished
Shared: City Builder · Strategy · Indie

Keep on Mining!
Shared: Casual · Idler · Indie

Nodebuster
Shared: Casual · Idler · Strategy

Lessaria: Fantasy Kingdom Sim
Shared: City Builder · Strategy · Fantasy

ISLANDERS: New Shores
Shared: Casual · City Builder · Strategy

Totally Accurate Battle Simulator
Shared: Strategy · Colorful · Indie

Mirror 2: Project X
Shared: 3D · Casual · Singleplayer

Slime Rancher 2
Shared: Colorful · Casual · Singleplayer

Click the Button
Shared: Casual · Idler · Indie

Mini Motorways
Shared: Casual · Strategy · Indie