Single-player games like Nienix: Cosmic Warfare
Below are 15 single-player Steam games similar to Nienix: Cosmic Warfare, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Nienix: Cosmic Warfare page.
Ranked picks
- 1
Reveniev: A Day in Nassiriyah
Single-player alternative to Nienix: Cosmic Warfare — playable solo, no multiplayer required. Shares Action and Adventure with Nienix: Cosmic Warfare.
Get your revenge in REVENIEV!
- 2
AntiShatter
Single-player alternative to Nienix: Cosmic Warfare — playable solo, no multiplayer required. Shares Action and RPG with Nienix: Cosmic Warfare.
Pilot your own Spaceship in this Sci-fi Space Shooter game! Shoot Asteroids to collect Antimatter, Metals, and Pickups! Use the Metals and Antimatter you collect to upgrade your Spaceship! Level up to unlock stronger Metal tiers to collect, craft or buy Parts from the Store! Survive endless Space!
- 3
Vestalborne
Single-player alternative to Nienix: Cosmic Warfare — playable solo, no multiplayer required. Shares Action and Indie with Nienix: Cosmic Warfare.
Break the world, then build your own. Vestalborne is an unlimited open-world survival crafting RPG: mine, farm, build and destroy across procedural dimensions, and fight the rising danger. Collect Embers, grow stronger, and keep the Eternal Flame burning solo, with friends, or against them.
- 4
The Lower Worlds I: Valenfeld
Single-player alternative to Nienix: Cosmic Warfare — playable solo, no multiplayer required. Shares Indie and RPG with Nienix: Cosmic Warfare.
Valenfeld is a Co-Op RPG with a procedurally generated Open World and Dungeons. Combine Warrior, Rogue, Wizard, Cleric, Druid, and Necromancer into custom classes, with in depth talent trees and combinations. Join a living world of factions, monsters and war where your choices matter.
- 5
Crystal Squad
Single-player alternative to Nienix: Cosmic Warfare — playable solo, no multiplayer required. Shares Action and Indie with Nienix: Cosmic Warfare.
You are hot on the trail of kidnapped villagers, brutal Warrior Bears block your path. Join the Crystal Squad and fight with destructive custom-built weapons to fight back!
- 6
Operation: Black Genesis - The Immortal Trials
Single-player alternative to Nienix: Cosmic Warfare — playable solo, no multiplayer required. Shares Action and Adventure with Nienix: Cosmic Warfare.
top-down co-op survival horror game where players deploy into deadly Quarantined Zones, fight mutated experiments, and extract with everything you can carry—because if you die, you lose it all.
- 7
Free Stars: Children of Infinity
Single-player alternative to Nienix: Cosmic Warfare — playable solo, no multiplayer required. Shares Action and Indie with Nienix: Cosmic Warfare.
Experience a stellar space adventure and the sequel to The Ur-Quan Masters. Travel through hyperspace, engage in fast-paced combat, discover weird worlds, and meet a unique cast of truly alien aliens as you uncover a mystery that threatens the galaxy.
- 8
Black Ice
Single-player alternative to Nienix: Cosmic Warfare — playable solo, no multiplayer required. Shares Action and Indie with Nienix: Cosmic Warfare.
Hack greedy megacorps to help as many people as you can in a high-agility cyberpunk looter/shooter RPG. Explore neon cyberspace vistas and outmaneuver AIs to customize your hacker OS and weapon combos. Play solo or online co-op with up to 10 people!
- 9
VoidExpanse
Single-player alternative to Nienix: Cosmic Warfare — playable solo, no multiplayer required. Shares Action and Indie with Nienix: Cosmic Warfare.
Explore the vast reaches of VoidExpanse -- mine asteroids, upgrade your ship, trade, complete missions, advance your character and survive fast-paced combat with hostile aliens and mercenaries in the rich and exciting Sci-Fi universe of VoidExpanse!
- 10
Path of Exile
Single-player alternative to Nienix: Cosmic Warfare — playable solo, no multiplayer required. Shares Action and Indie with Nienix: Cosmic Warfare.
You are an Exile, struggling to survive on the dark continent of Wraeclast, as you fight to earn power that will allow you to exact your revenge against those who wronged you. Path of Exile is an online Action RPG set in a dark fantasy world. The game is completely free and will never be pay-to-win.
- 11
Star Valor
Single-player alternative to Nienix: Cosmic Warfare — playable solo, no multiplayer required. Shares Action and Indie with Nienix: Cosmic Warfare.
Choose your own destiny as you explore an open-world procedurally generated galaxy where anything is possible. Become a miner, a trader, a bounty hunter, a pirate, or perhaps a jack of all trades. Start off small and build your way to the top but remember with every action, comes consequences.
- 12
Space Pirates and Zombies
Single-player alternative to Nienix: Cosmic Warfare — playable solo, no multiplayer required. Shares Action and Indie with Nienix: Cosmic Warfare.
Explore a randomly generated Galaxy populated with factions, enemies, missions, and items providing you with a unique experience each time you play.
- 13
Diablo® IV
Single-player alternative to Nienix: Cosmic Warfare — playable solo, no multiplayer required. Shares Action and Adventure with Nienix: Cosmic Warfare.
Join the fight for Sanctuary in Diablo® IV, the ultimate action RPG adventure. Experience the critically acclaimed campaign and new seasonal content.
- 14
Grim Dawn
Single-player alternative to Nienix: Cosmic Warfare — playable solo, no multiplayer required. Shares Action and Indie with Nienix: Cosmic Warfare.
Enter an apocalyptic fantasy world where humanity is on the brink of extinction, iron is valued above gold and trust is hard earned. This ARPG features complex character development, hundreds of unique items, crafting and quests with choice & consequence.
- 15
Drox Operative 2
Single-player alternative to Nienix: Cosmic Warfare — playable solo, no multiplayer required. Shares Action and Indie with Nienix: Cosmic Warfare.
Drox Operative 2 is a starship action RPG with warring alien races, fierce space battles, a dynamic, evolving galaxy, and co-op multiplayer for Windows and Linux.