Games like Space Travel Idle
Space Travel Idle leans idle. These games share the most with it, and each one says why.

Stuck In Time
Also optimization, exploration · Same active/idle balance (leans idle)
Plan action lists for each time loop, let them run, and refine routes through a pixel-art world as you work toward escape.
85% steamhas ending70% idle
Vanguard Galaxy
Also space, exploration
Fight, mine, salvage and trade across a procedural galaxy, played full screen or docked on your desktop with an autopilot that can run things.
90% steam50% idle
Unnamed Space Idle
Also space · Same active/idle balance (leans idle)
A ship, a sector map and a tidy prestige loop. Quietly one of Galaxy's most-played games.
92% steam4.5★ galaxy70% idle
Cell to Singularity
Also science · Same active/idle balance (leans idle)
Evolve life from a single cell to a technological singularity, with a surprising amount of real science in the tooltips.
89% steam70% idle
THE LONGING
Also exploration · Same active/idle balance (leans idle)
Wait 400 real days in an underground palace for a king to wake. The clock runs while the game is closed, so you can explore or simply leave.
92% steamhas ending70% idle
Angel Legion
Also space · Same active/idle balance (leans idle)
A 3D hero-collection RPG where resources build up automatically. Recruit and dress a roster of angels across three warring space factions.
85% steam70% idle
Space industrial empire
Also space · Same active/idle balance (leans idle)
Lay out flat conveyor lines for mining, smelting and research, then build warships to take other planets.
87% steam70% idle
Mr.Mine
Also exploration · Same active/idle balance (leans idle)
Dig a mine deeper and deeper, hire miners, discover what lives at the bottom.
92% steam75% idle
Transport Defender
Also space · Same active/idle balance (leans idle)
Guard a cargo ship from boarding waves with a turret and auto weapons, scripting auto upgrades and auto ascension for long idle runs.
80% steam70% idle
How To Grow a Black Hole
Also space, science
Feed a black hole to gain mass, research automation and avoid collapses, comparing its size against real objects and global leaderboards.
67% steam
Idle Space Raider
Also space · Same active/idle balance (leans idle)
Patrol space as a station guard, mining ore and fighting in raids, then upgrade your ship and station. Toggles automate most systems, and a stargate opens a second reset tier.
74% steam70% idle
NG Space Company
Also space, exploration
A space incremental about mining resources, exploring between stars and conquering systems.
4.2★ galaxy
Creature Card Idle
Also optimization · Same active/idle balance (leans idle)
Place cards on a grid so they produce resources, then spend those on booster packs. Each expansion is its own small idle game, and later ones add battles.
71% steam70% idle
Industry IdleDormant
Also optimization · Same active/idle balance (leans idle)
Build factories on generated maps, optimize production chains, trade on a player market and prestige for new maps, with offline earnings tied to company value.
77% steam75% idle
Idle Expanse
Also space, exploration
Run a greedy corporation that equips mercenary squads and sends them to 64 alien planets for resources, setting their tactics and researching a time skip.
55% steam
Space Colonizers Idle ClickerUpdated
Also space, exploration
Upgrade a spacecraft to find new planets for humanity, using black holes as shortcuts and meeting alien species along the way.
45% steam
Black Hole Shrinker
Also space, science
Shrink a black hole through Hawking radiation to collect quarks.
3.7★ galaxy
The Near Future: Incremental
Also space, science
Turn energy into computation, build self-replicating foundries and expand from Earth across the solar system.

Darkzone: Idle RPG
Also space · Same active/idle balance (leans idle)
A multiplayer idle RPG about space bounty hunters with auto turn-based combat, deep gear crafting, guilds, seasons, and live co-op boss raids.
62% steam70% idle
Galaxy Idle Clicker
Also space · Same active/idle balance (leans idle)
Upgrade a spaceship to conquer over 5,000 areas across seven universes, with four reset systems, four minigames and offline farming.
74% steam75% idle
Void Salvage
Also space, exploration
An FTL-like ship sim with pick-one-of-three rewards and choice encounters, where you combine SYSTEM parts and fit SOCKET INSERTs.
3.0★ galaxy
MyceliumUpdated
Also optimization, exploration
Spread a fungal network through forest soil, weighing nearby poor ground against distant rich deposits since resources must travel back to the core.

TerraGenesis - Space SettlersUpdated
Also space, science
Terraform real and fictional planets using NASA data, building habitats and choosing among four factions.

Idle Cooking Emperor
Also optimization · Same active/idle balance (leans idle)
Train as a cook, win restaurants in duels, staff them with beaten rivals, and tune recipes and ingredient combos. Retire to raise a stronger pupil.
55% steam70% idle