Games like 1971 Project Helios
Games like 1971 Project Helios include Plague Inc: Evolved, HighFleet, Into the Breach, XCOM 2, and The Banner Saga 2. We matched them by the tags players give 1971 Project Helios on Steam (Indie, Strategy, Tactical, Post-apocalyptic, and Alternate History): closest matches first, and among equally close ones the better-known games.

Plague Inc: Evolved
Shared: Strategy · Indie · Tactical

HighFleet
Shared: Indie · Strategy · Post-apocalyptic

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

XCOM 2
Shared: Strategy · Tactical · Post-apocalyptic

The Banner Saga 2
Shared: Strategy · Indie · Story Rich

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

Wasteland 2: Director's Cut
Shared: Strategy · Post-apocalyptic · Tactical

The Banner Saga 3
Shared: Strategy · Indie · Story Rich

XCOM: Enemy Unknown
Shared: Strategy · Tactical · Turn-Based Strategy

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

Crying Suns
Shared: Strategy · Indie · Tactical

Total War: WARHAMMER III
Shared: Strategy · Turn-Based Strategy · Tactical

Total War: ROME II - Emperor Edition
Shared: Strategy · Tactical · Turn-Based Strategy

Hearts of Iron IV
Shared: Strategy · Alternate History · Tactical

Shadow Tactics: Blades of the Shogun
Shared: Strategy · Tactical · Indie

Blackguards
Shared: Strategy · Tactical · Indie

Warhammer 40,000: Chaos Gate - Daemonhunters
Shared: Tactical · Strategy · Turn-Based Strategy

Warhammer 40,000: Mechanicus
Shared: Strategy · Tactical · Indie

Mutant Year Zero: Road to Eden
Shared: Strategy · Post-apocalyptic · Tactical

Wargroove
Shared: Strategy · Indie · Turn-Based Strategy

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

Library Of Ruina
Shared: Strategy · Story Rich · Indie

Expeditions: Conquistador
Shared: Strategy · Indie · Turn-Based Strategy

Phoenix Point
Shared: Tactical · Strategy · Turn-Based Strategy