Single-player games like I'm lost in space
Below are 8 single-player Steam games similar to I'm lost in space, 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 I'm lost in space page.
Ranked picks
- 1
Intergalactic Defenders
Single-player alternative to I'm lost in space — playable solo, no multiplayer required. Shares Action and Adventure with I'm lost in space.
Intergalactic Defenders is a retro pixel art space shooter with rogue-like progression, handcrafted levels, deep ship customization, and intense arcade combat. Defend humanity against an alien invasion across the galaxy.
- 2
Star Devil
Single-player alternative to I'm lost in space — playable solo, no multiplayer required. Shares Action and Indie with I'm lost in space.
Star Devil is a Sci-fi Station Survival Roguelike Game with dynamic alien infection. Playable in both single player and split-screen co-op.
- 3
Mach K9
Single-player alternative to I'm lost in space — playable solo, no multiplayer required. Shares Action with I'm lost in space.
Physics roguelite. Smash aliens out of the arena to defeat them. Choose upgrades after each wave, and complete every wave to win. Unlock additional upgrades as you play.
- 4
Achilles: Survivor
Single-player alternative to I'm lost in space — playable solo, no multiplayer required. Shares Action and Adventure with I'm lost in space.
Thousands of enemies. One survivor. Fight like a demigod, build deadly defenses, and grow stronger after every run in this fast-paced bullet heaven set in mythic Greece.
- 5
Shoulders of Giants: Ultimate
Single-player alternative to I'm lost in space — playable solo, no multiplayer required. Shares Action with I'm lost in space.
Simultaneously control a sword-wielding robot and a gunslinging space frog in Shoulders of Giants, an explosively colourful sci-fi roguelike. Play alone, with a friend, or as part of a four-person team, cutting through waves of enemies on a quest to rescue the galaxy from the forces of Entropy!
- 6
CRYPTARK
Single-player alternative to I'm lost in space — playable solo, no multiplayer required. Shares Action and Indie with I'm lost in space.
Cryptark is a 2D sci-fi shooter where you take on the role of a heavily armed privateer seeking to earn government contracts by boarding deadly alien space-hulks. It's up to you to strategize a plan of attack, pick an equipment loadout, and destroy the central core to be victorious.
- 7
Gatekeeper
Single-player alternative to I'm lost in space — playable solo, no multiplayer required. Shares Action and Indie with I'm lost in space.
Gatekeeper is a fast-paced rogue-like. Go on a quest to chase down Chaos and reclaim the stolen Heart of Time, fighting your way through relentless enemy forces. Play solo or in 4-player co-op and become the next Gatekeeper!
- 8
Heat Signature
Single-player alternative to I'm lost in space — playable solo, no multiplayer required. Shares Action and Indie with I'm lost in space.
Heat Signature is a game from the developers of Gunpoint where you break into spaceships, make terrible mistakes, and think of clever ways out of them. You take a mission, fly to the target ship, sneak inside, and make clever use of your gadgets to distract, ambush and take out the crew.