Games like ReEarth
Games like ReEarth include Creeper World 4, Kingdom Heroes 8, Total War: WARHAMMER, Broken Arrow, and Bad North: Jotunn Edition. We matched them by the tags players give ReEarth on Steam (Strategy, RTS, RPG, Roguelike, and Tower Defense): closest matches first, and among equally close ones the better-known games.

Creeper World 4
Shared: Tower Defense · RTS · Real Time Tactics

Kingdom Heroes 8
Shared: RTS · Strategy · Real Time Tactics

Total War: WARHAMMER
Shared: Strategy · RPG · RTS

Broken Arrow
Shared: Strategy · RTS · Wargame

Bad North: Jotunn Edition
Shared: Wargame · Tower Defense · Real Time Tactics

WARNO
Shared: RTS · Strategy · Wargame

Tabletop Tavern
Shared: Strategy · RTS · Roguelike

Dungeon of the ENDLESS™
Shared: Strategy · Roguelike · Tower Defense

Call to Arms - Gates of Hell: Ostfront
Shared: Strategy · RTS · Real Time Tactics

Wargame: Red Dragon
Shared: Strategy · RTS · Wargame

The King is Watching
Shared: Roguelike · RTS · Tower Defense

Total War: WARHAMMER II
Shared: Strategy · RTS · Real Time Tactics

Planetary Annihilation: TITANS
Shared: Strategy · RTS · Real Time Tactics

Tower Dominion
Shared: Strategy · Tower Defense · RTS

Touhou Monster TD ~ 幻想乡妖怪塔防
Shared: RPG · Tower Defense · RTS

Terminator: Dark Fate - Defiance
Shared: Strategy · RTS · Real Time Tactics

Total War: WARHAMMER III
Shared: Strategy · RTS · Real Time Tactics

Company of Heroes 3
Shared: Strategy · RTS · Wargame

Last Train Home
Shared: Strategy · RTS · Real Time Tactics

Three Kingdoms: Innovatory
Shared: RTS · Strategy · Real Time Tactics

Sudden Strike 4
Shared: Strategy · RTS · Real Time Tactics

Men of War: Assault Squad 2
Shared: Strategy · RTS · Real Time Tactics

FTL: Faster Than Light
Shared: Strategy · Roguelike · Space

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