Games like Solaris
Games like Solaris include Total War: WARHAMMER III, Total War: WARHAMMER II, Dota Underlords, XCOM 2, and Age of Wonders 4. We matched them by the tags players give Solaris on Steam (Strategy, 4X, Real Time Tactics, 2D, and Sci-fi): closest matches first, and among equally close ones the better-known games.

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

Total War: WARHAMMER II
Shared: Strategy · Fantasy · War

Dota Underlords
Shared: Strategy · Free to Play · Tactical

XCOM 2
Shared: Strategy · Tactical · Sci-fi

Age of Wonders 4
Shared: Strategy · 4X · Fantasy

Sid Meier’s Civilization® VI
Shared: Strategy · 4X · Multiplayer

ENDLESS Legend™
Shared: Strategy · 4X · Fantasy

Warhammer 40,000: Gladius - Relics of War
Shared: Strategy · 4X · Sci-fi

Total War: ROME II - Emperor Edition
Shared: Strategy · Tactical · Real Time Tactics

Heroes of Might and Magic: Olden Era
Shared: Strategy · 4X · Tactical

Battlefleet Gothic: Armada (Classic)
Shared: Strategy · Sci-fi · Real Time Tactics

Songs of Conquest
Shared: 4X · Tactical · Turn-Based Tactics

MENACE
Shared: Strategy · Tactical · Turn-Based Tactics

Total War: THREE KINGDOMS
Shared: Strategy · War · Real Time Tactics

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

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

ENDLESS Space™ 2
Shared: Strategy · 4X · Sci-fi

Dune: Spice Wars
Shared: Strategy · Sci-fi · 4X

Xenonauts 2
Shared: Strategy · Tactical · Sci-fi

Magic: The Gathering Arena
Shared: Strategy · Free to Play · Fantasy

Sid Meier's Civilization VII
Shared: Strategy · 4X · War

Omega Strikers
Shared: Strategy · Sci-fi · PvP