Games like Synchronicity
Games like Synchronicity include Plague Inc: Evolved, Tom Clancy's Rainbow Six Siege, Backpack Battles, WARDOGS, and Door Kickers. We matched them by the tags players give Synchronicity on Steam (Tactical, Asynchronous Multiplayer, Indie, Cyberpunk, and Simulation): closest matches first, and among equally close ones the better-known games.

Plague Inc: Evolved
Shared: Indie · Simulation · Tactical

Tom Clancy's Rainbow Six Siege
Shared: Tactical · PvP · Multiplayer

Backpack Battles
Shared: Asynchronous Multiplayer · PvP · Tactical

WARDOGS
Shared: Tactical · PvP · Multiplayer

Door Kickers
Shared: Tactical · Simulation · Indie

Yu-Gi-Oh! Master Duel
Shared: PvP · Tactical · Simulation

Frozen Synapse
Shared: Tactical · Indie · Asynchronous Multiplayer

Counter-Strike 2
Shared: Tactical · Multiplayer · PvP

DEFCON
Shared: Indie · Simulation · Tactical

Satellite Reign
Shared: Cyberpunk · Tactical · Indie

Warhammer 40,000: Battlesector
Shared: Tactical · Asynchronous Multiplayer · Turn-Based Combat

PUBG: BATTLEGROUNDS
Shared: PvP · Tactical · Multiplayer

Bodycam
Shared: Tactical · Multiplayer · Simulation

Squad
Shared: Tactical · PvP · Multiplayer

Heroes of Might and Magic: Olden Era
Shared: Tactical · Simulation · Multiplayer

XCOM 2
Shared: Tactical · Turn-Based Combat · Strategy

Door Kickers 2: Task Force North
Shared: Tactical · Top-Down · Indie

Due Process
Shared: Tactical · Cyberpunk · PvP

Sid Meier’s Civilization® VI
Shared: Tactical · Multiplayer · Simulation

Isonzo
Shared: Indie · Simulation · PvP

Arma 3
Shared: Simulation · Tactical · Multiplayer

Othercide
Shared: Indie · Turn-Based Combat · Tactical

Mordheim: City of the Damned
Shared: Tactical · Turn-Based Combat · Strategy

Into the Breach
Shared: Indie · Tactical · Strategy