Games like Fusionist
Games like Fusionist include BattleTech, Heroes of Might and Magic: Olden Era, Battle Brothers, STAR WARS Zero Company™, and MENACE. We matched them by the tags players give Fusionist on Steam (Turn-Based Tactics, Turn-Based Strategy, Strategy, Mechs, and Simulation): closest matches first, and among equally close ones the better-known games.

BattleTech
Shared: Turn-Based Tactics · Strategy · Mechs

Heroes of Might and Magic: Olden Era
Shared: Strategy · Turn-Based Strategy · RPG

Battle Brothers
Shared: Strategy · Turn-Based Strategy · Turn-Based Tactics

STAR WARS Zero Company™
Shared: Turn-Based Tactics · Turn-Based Strategy · Strategy

MENACE
Shared: Strategy · Turn-Based Strategy · Turn-Based Tactics

Football, Tactics & Glory
Shared: Turn-Based Tactics · Turn-Based Strategy · Strategy

The Last Spell
Shared: Turn-Based Strategy · Strategy · Turn-Based Tactics

Super Robot Wars 30
Shared: Strategy · Turn-Based Strategy · Mechs

XCOM 2
Shared: Strategy · Turn-Based Tactics · RPG

Into the Breach
Shared: Turn-Based Strategy · Strategy · Turn-Based Tactics

Jagged Alliance 3
Shared: Turn-Based Tactics · Strategy · Turn-Based Strategy

The Dungeon Of Naheulbeuk: The Amulet Of Chaos
Shared: Turn-Based Tactics · RPG · Strategy

Sid Meier’s Civilization® VI
Shared: Turn-Based Strategy · Strategy · Singleplayer

XCOM®: Chimera Squad
Shared: Turn-Based Tactics · Strategy · Turn-Based Strategy

Xenonauts 2
Shared: Strategy · Turn-Based Strategy · Turn-Based Tactics

Phantom Brigade
Shared: Turn-Based Tactics · Mechs · Simulation

鬼谷八荒 Tale of Immortal
Shared: Simulation · Singleplayer · RPG

Cities: Skylines
Shared: Simulation · Strategy · Singleplayer

Mecharashi
Shared: Strategy · Turn-Based Strategy · Turn-Based Tactics

Breach & Clear
Shared: Strategy · Turn-Based Strategy · Simulation

Mount & Blade II: Bannerlord
Shared: Strategy · RPG · Singleplayer

Empire of Sin
Shared: Strategy · Turn-Based Tactics · RPG

Sid Meier's Civilization VII
Shared: Strategy · Simulation · Turn-Based Tactics

Sultan's Game
Shared: Strategy · Singleplayer · RPG