Single-player games like Event Horizon
Below are 9 single-player Steam games similar to Event Horizon, 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 Event Horizon page.
Ranked picks
- 1

Starcom: Nexus
Single-player alternative to Event Horizon — playable solo, no multiplayer required. Shares Action and Indie with Event Horizon.
Suddenly thrown into an unknown galaxy, you must explore, fight or befriend aliens and transform your ship from a small survey vessel into a powerful battlecruiser to unravel the mystery of the forces that brought you here and find your way home.
- 2

Star Valor
Single-player alternative to Event Horizon — playable solo, no multiplayer required. Shares Action and Indie with Event Horizon.
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.
- 3

Space Impossible
Single-player alternative to Event Horizon — playable solo, no multiplayer required. Shares Action and Indie with Event Horizon.
Take control of a fully destructible spaceship and explore, blast or trade your way through the cosmos, alone or with friends. Every tile matters, as you dogfight, maneuver or speed your way past friendly traders, hostile aliens, and impressive space navies. What will you do, Captain?
- 4

Ceres
Single-player alternative to Event Horizon — playable solo, no multiplayer required. Shares Action and Indie with Event Horizon.
Take control of a squadron of ships in full 3D space combat. Explore, battle and trade your way through a pirate, machine and monster-infested solar system.
- 5

Elite Dangerous
Single-player alternative to Event Horizon — playable solo, no multiplayer required. Shares Action with Event Horizon.
Take control of your own starship and blaze your trail in an ever-changing galaxy. Master the arts of combat, mining and trade or venture out into the unknown across a 1:1 scale universe.
- 6

EVERSPACE™ 2
Single-player alternative to Event Horizon — playable solo, no multiplayer required. Shares Action and RPG with Event Horizon.
EVERSPACE 2 is a fast-paced single-player spaceship shooter with exploration in space and on planets, tons of loot, RPG elements, mining, and crafting. Experience an exciting sci-fi story set in a vivid, handcrafted open world full of secrets, puzzles, and perils.
- 7

Transcendence
Single-player alternative to Event Horizon — playable solo, no multiplayer required. Shares Action and Indie with Event Horizon.
Explore the farthest reaches of Human Space in this open-world space adventure. Compelled to journey to the Galactic Core by a mysterious hyperintelligence, you must fight your way through dozens of star systems teeming with clashing empires, expansionist AIs, and fearsome xenophobes.
- 8

Endless Sky
Single-player alternative to Event Horizon — playable solo, no multiplayer required. Shares Action and Indie with Event Horizon.
Endless Sky is a 2D space trading and combat game inspired by the classic Escape Velocity series. Work your way up from a relatively wimpy shuttle, cargo ship, or fighter, to a highly upgraded and customized flagship or to a massive fleet of warships or freighters.
- 9

Event Horizon - Frontier
Single-player alternative to Event Horizon — playable solo, no multiplayer required. Shares Action and Indie with Event Horizon.
Build an invincible starbase and protect it from enemies. Choose your fleet from an expanse of ships to suit your playstyle, and use the best weapons and modules you have to hand to destroy invaders.