Single-player games like Outcasts of Orion
Below are 8 single-player Steam games similar to Outcasts of Orion, 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 Outcasts of Orion page.
Ranked picks
- 1
Celestial Project
Single-player alternative to Outcasts of Orion — playable solo, no multiplayer required. Shares Strategy with Outcasts of Orion.
"Celestial Project" is a Roguelike WarChess game. It is the first game of the story "Celestial". Command the special operations forces, resist and study unknown alien creatures from space, defend the five starship civilization spacecraft under construction on earth, and retain human kindling!
- 2
Battle Grid
Single-player alternative to Outcasts of Orion — playable solo, no multiplayer required.
Face relentless alien hordes, collect their resources and assemble an unstoppable squadron of mechs! In this Action Roguelite, discover game-breaking synergies, mix and match weapons and units, unlock upgrades, harvest and conquer alien planets.
- 3
Million Monster Militia
Single-player alternative to Outcasts of Orion — playable solo, no multiplayer required. Shares Strategy with Outcasts of Orion.
A roguelike autobattling deckbuilder. Draft an army of… Succubi? Tax Accountants? Whales? It’s up to you! Discover thousands of possible synergies based on what fighters you choose. Fights are snappy and turn-based. Recruit your army and let them fight for you!
- 4
X-COM: Apocalypse
Single-player alternative to Outcasts of Orion — playable solo, no multiplayer required. Shares Strategy with Outcasts of Orion.
There's something evil in the city tonight... Earth has been ravaged by human excess, petty conflict and alien invasion. The world's population has been herded into huge cities, the first of which was Mega Primus. 2084: A Utopia shattered, social collapse and civil unrest reigns in Mega Primus. Fiendish aliens terrorize the city.
- 5
Invisible, Inc.
Single-player alternative to Outcasts of Orion — playable solo, no multiplayer required. Shares Strategy with Outcasts of Orion.
Take control of Invisible's agents in the field and infiltrate the world's most dangerous corporations. Stealth, precision, and teamwork are essential in high-stakes, high-profit missions, where every move may cost an agent their life.
- 6
ARC SEED
Single-player alternative to Outcasts of Orion — playable solo, no multiplayer required. Shares Strategy with Outcasts of Orion.
Face the interstellar Archangels in a turn-based tactical game with deckbuilding elements and destructible environment, where you pilot powerful mechs to save the Earth from destruction.
- 7
All Walls Must Fall - A Tech-Noir Tactics Game
Single-player alternative to Outcasts of Orion — playable solo, no multiplayer required.
All Walls Must Fall is a Tech-Noir Tactics game set in Berlin 2089, where the Cold War never ended.
- 8
Tyrant's Blessing
Single-player alternative to Outcasts of Orion — playable solo, no multiplayer required. Shares Strategy with Outcasts of Orion.
Tyberia has been turned into a paradise by the Tyrant, free from war, suffering, and death - because nearly everyone has been turned into the undead. Take charge of the last living warriors in tactical, turn-based battles and drive the Dead Army into the sea!