Games like Astroflux
Games like Astroflux include Warframe, Neverwinter, Star Trek Online, Blue Protocol: Star Resonance, and Marvel Rivals. We matched them by the tags players give Astroflux on Steam (Free to Play, Massively Multiplayer, Action, Adventure, and RPG): closest matches first, and among equally close ones the better-known games.

Warframe
Shared: Free to Play · Action · Massively Multiplayer

Neverwinter
Shared: Free to Play · Massively Multiplayer · RPG

Star Trek Online
Shared: Free to Play · Massively Multiplayer · Space

Blue Protocol: Star Resonance
Shared: Free to Play · Action · Adventure

Marvel Rivals
Shared: Free to Play · Action · Massively Multiplayer

Once Human
Shared: Free to Play · Action · Adventure

Delta Force
Shared: Free to Play · Massively Multiplayer · Action

Endless Sky
Shared: Free to Play · Space · Adventure

Guild Wars 2®
Shared: Free to Play · Adventure · RPG

Wuthering Waves
Shared: Free to Play · Action · RPG

War Thunder
Shared: Free to Play · Action · Massively Multiplayer

Honkai Impact 3rd
Shared: Free to Play · Action · Adventure

Albion Online
Shared: Free to Play · Massively Multiplayer · RPG

SMITE®
Shared: Free to Play · Action · Massively Multiplayer

The Elder Scrolls Online - Standard Edition
Shared: RPG · Adventure · Massively Multiplayer

Destiny 2
Shared: Free to Play · Massively Multiplayer · Action

Last Oasis
Shared: Massively Multiplayer · Action · RPG

The First Descendant
Shared: Free to Play · Action · RPG

Karos
Shared: Free to Play · Massively Multiplayer · RPG

Apex Legends™
Shared: Free to Play · Action · Adventure

Where Winds Meet
Shared: Free to Play · Adventure · Massively Multiplayer

EVE Online
Shared: Adventure · Massively Multiplayer · Space

Halo Infinite
Shared: Free to Play · Action · Space

South Park™: The Stick of Truth™
Shared: RPG · Adventure · Action