Games like Merge Command
Games like Merge Command include Mechabellum, The Bazaar, Legion TD 2 - Multiplayer Tower Defense, Backpack Battles, and Plague Inc: Evolved. We matched them by the tags players give Merge Command on Steam (Auto Battler, Automation, PvE, Strategy, and 2D): closest matches first, and among equally close ones the better-known games.

Mechabellum
Shared: Auto Battler · Strategy · PvP

The Bazaar
Shared: Auto Battler · Strategy · PvP

Legion TD 2 - Multiplayer Tower Defense
Shared: Auto Battler · PvP · Strategy

Backpack Battles
Shared: Auto Battler · PvP · Strategy

Plague Inc: Evolved
Shared: Strategy · Casual · PvP

Mindustry
Shared: Automation · Strategy · 2D

ARC Raiders
Shared: PvE · PvP · Sci-fi

ShellShock Live
Shared: Strategy · 2D · Casual

Factorio
Shared: Automation · Strategy · 2D

Squad
Shared: PvP · PvE · Tactical

Oaken Tower
Shared: Auto Battler · Strategy · PvP

Cosmoteer: Starship Architect & Commander
Shared: Sci-fi · 2D · Strategy

9 Kings
Shared: Auto Battler · Strategy · PvP

GLADIABOTS - AI Combat Arena
Shared: Strategy · PvE · PvP

Draw & Guess
Shared: Casual · PvP · 2D

XCOM 2
Shared: Strategy · Tactical · Sci-fi

Firestone – Idle Clicker Online RPG
Shared: Auto Battler · PvE · Strategy

BidKing
Shared: Strategy · Casual · PvP

Marathon
Shared: PvP · Sci-fi · PvE

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

Sins of a Solar Empire II
Shared: Strategy · Sci-fi · PvE

STAR WARS™ Empire at War - Gold Pack
Shared: Strategy · Sci-fi · PvP

Bloons TD 6
Shared: Strategy · Casual · Multiplayer

Warhammer 40,000: Dawn of War - Definitive Edition
Shared: Strategy · PvE · Sci-fi