Single-player games like Space Defender
Below are 8 single-player Steam games similar to Space Defender, 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 Space Defender page.
Ranked picks
- 1
Cosmic Ray
Single-player alternative to Space Defender — playable solo, no multiplayer required. Shares Action and Indie with Space Defender.
A game about exploring space in search of hospitable planets for colonization. Casual gameplay and short rounds make it a great option for killing a few minutes.
- 2
Space Battle
Single-player alternative to Space Defender — playable solo, no multiplayer required. Shares Action and Indie with Space Defender.
Pilot your ship through dangerous space and defend against relentless imperial attacks in Space Battle, a high-intensity round-based strategy game. Upgrade your ship, mine for essential resources, and survive the onslaught to protect the galaxy!
- 3
Gospel of Abaddon
Single-player alternative to Space Defender — playable solo, no multiplayer required. Shares Action and Indie with Space Defender.
Gospel of Abaddon is a 2D mix of RPG, Shooter and Roguelike. During WW2, an American pastor deserts the army and after using amphetamine, he sees God telling him to destroy the entire sinful world...
- 4
Ostallian Core
Single-player alternative to Space Defender — playable solo, no multiplayer required. Shares Action and Indie with Space Defender.
A modern omnidirectional space shooter with colorful retro-style ASCII art and light RPG elements, featuring optional permadeath.
- 5
Beyond Horizon
Single-player alternative to Space Defender — playable solo, no multiplayer required. Shares Action and Indie with Space Defender.
Battle across the galaxy, defeat powerful bosses, and uncover the mystery of Kuma's missing sister in this fast-paced top-down space shooter.
- 6
Arcadium - Space Odyssey
Single-player alternative to Space Defender — playable solo, no multiplayer required. Shares Action and Indie with Space Defender.
Arcadium is a survival roguelite set in a dynamic, ever-changing universe. Journey across space, harvest planetary resources, and craft powerful builds to eradicate relentless waves of aliens. Each playthrough unveils a new and uncharted universe, ensuring endless challenges and discoveries.
- 7
Insect Swarm
Single-player alternative to Space Defender — playable solo, no multiplayer required. Shares Action and Indie with Space Defender.
The insect swarm is a swarm consists of millions of alien insects, and you, as the only survival on this barren planet, will have to fight against them dauntlessly. Good luck!
- 8
✌ Johnny Rocket
Single-player alternative to Space Defender — playable solo, no multiplayer required. Shares Action and Indie with Space Defender.
A comic adventure introducing Johnny Rocket in an action platformer game stylized as a free-hand black and white cartoon.