Single-player games like Spacejacked
Below are 8 single-player Steam games similar to Spacejacked, 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 Spacejacked page.
Ranked picks
- 1

Space Run
Single-player alternative to Spacejacked — playable solo, no multiplayer required. Shares Indie with Spacejacked.
Space Run is a «real-time spaceship construction strategy game». Space Run takes the well-known Tower Defense-style gameplay and twists it, challenging you to manage and protect a spaceship and its cargo against the hazards of deep space!
- 2

Infested Planet
Single-player alternative to Spacejacked — playable solo, no multiplayer required. Shares Action and Indie with Spacejacked.
Command a team of 5 elite soldiers against an alien horde of 100,000. Surrounded on all sides, you must outmaneuver and outsmart the enemy.
- 3

Monsters are Coming!
Single-player alternative to Spacejacked — playable solo, no multiplayer required. Shares Action and Indie with Spacejacked.
Beware, Monsters are Coming! In this Tower-Survivor rogue-lite, you protect an ever-moving city from unrelenting hordes. Gather resources, fortify defences, and survive for as long as you can. Will you reach the Ark?
- 4

X-Morph: Defense
Single-player alternative to Spacejacked — playable solo, no multiplayer required. Shares Action and Indie with Spacejacked.
Unique fusion of a top-down shooter and tower defense strategy. You are the invader! Use destructive weapons or lead your enemies into a maze of towers. Strategize in the build mode by carefully selecting various types of alien towers or throw yourself right into the heat of the battle.
- 5

Sanctum 2
Single-player alternative to Spacejacked — playable solo, no multiplayer required. Shares Action and Indie with Spacejacked.
Sanctum 2 is the sequel to the world’s first Tower Defense/FPS hybrid game. Pick from four unique character classes and embark on a mission to protect the oxygen-producing Cores from hordes of deadly aliens who are threatened by their existence.
- 6

Tower Wars
Single-player alternative to Spacejacked — playable solo, no multiplayer required. Shares Action and Indie with Spacejacked.
Tower Wars combines elements of tower defense, RTS, and all-out multi-player mayhem to bring you a completely unique experience, delivered with a fun and funny not-so-old world style!
- 7

Revenge of the Titans
Single-player alternative to Spacejacked — playable solo, no multiplayer required. Shares Action and Indie with Spacejacked.
The ultimate mash-up of Real-time Strategy and Tower Defense!
- 8

Defense Grid: The Awakening
Single-player alternative to Spacejacked — playable solo, no multiplayer required. Shares Indie with Spacejacked.
Defense Grid: The Awakening is a unique spin on tower defense gameplay that will appeal to players of all skill levels. A horde of enemies is invading, and it's up to the player to stop them by strategically building fortification towers around their base.