Games like Planetidal
Planetidal. These games share the most with it, and each one says why.

To The Core
Also space, planet
Fly between planets, drill for resources until fuel runs out, and buy upgrades so each dig reaches deeper than the last.
93% steam
Universe Shrinker
Also space, pure numbers
Buy shrinkers that divide a universe's size each second, then move on to shrinking ever larger things on the way to the Heat Death.
4.1★ galaxy
SporbsUpdated
Also space, planet
Hover over alien organisms to harvest them without clicking, feed a fuel factory, and work through a 170-node skill tree toward a ride home.
77% steam4.1★ galaxyhas ending
Space industrial empire
Also space, planet
Lay out flat conveyor lines for mining, smelting and research, then build warships to take other planets.
87% steam70% idle
Planet No MoreComing soon
Also space, planet
Bombard 3D planets until they crumble, sweep up the debris before fuel runs out, and destroy each core to unlock the next body.
3.9★ galaxy
The Limitless Journey
Also pure numbers, space
Start with a single cursor and push your point count toward 1e200 as you travel across a vast universe.
3.6★ galaxyhas ending
MassDormant
Also space, planet
Generate mass and spend it on increasingly expensive planets to build out a solar system.
Solar ColonyUpdated
Also space, planet
Click to launch payloads from the Moon's mass driver, timing the orbit to reach Mars, Venus or Mercury and slowly colonize the inner solar system.

Code: Terraform
Also planet, space
Write Python-like scripts to run rovers, power grids, smelters and drone fleets on a frozen alien world, with your code working while you plan.
83% steam
Mining Guild IdleUpdated
Also space, planet
Mine ore on an empty planet and load cargo ships to sell it off-world. An expanded follow-up to an earlier prototype.
2.5★ galaxy![rock[et] cover art](/art/rock-et.webp)
rock[et]Coming soon
Also space, planet
Break asteroids for minerals after crash-landing on an alien world, picking from a cast of characters with unique skills to build runs and repair your ship.
3.2★ galaxyhas ending
TerraGenesis - Space SettlersUpdated
Also planet, space
Terraform real and fictional planets using NASA data, building habitats and choosing among four factions.

Idle Pocket PlanetUpdated
Also space, planet
Combine settlements and ships on small planets to build new constructs, colonizing strange galaxies and filling a journal with artifacts.

Idle Expanse
Also space, planet
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, planet
Upgrade a spacecraft to find new planets for humanity, using black holes as shortcuts and meeting alien species along the way.
45% steam
Unnamed Space Idle
Also space
A ship, a sector map and a tidy prestige loop. Quietly one of Galaxy's most-played games.
92% steam4.5★ galaxy70% idle
Antimatter DimensionsUpdated
Also pure numbers
Buy dimensions that buy dimensions, then break infinity, then break reality. The reference point every numbers-go-up game is measured against, and it has a real ending.
92% steam4.6★ galaxy200–600h ending55% idle
DodecaDragons
Also pure numbers
Twelve dragons, twelve colours of magic, and one of Galaxy's most-favourited games. Big numbers, handsome UI.
4.6★ galaxyhas ending55% idle
Terraformental
Also planet
Terraform a dead world with elemental forces. A highly rated Galaxy original.
4.6★ galaxy
Calculator Evolution
Also pure numbers
Upgrade a pocket calculator into something with far too many digits. Clever programming-flavoured progression.
4.5★ galaxy55% idle
The Prestige TreeComplete
Also pure numbers
A skill tree where every node is a prestige layer. It spawned the Modding Tree and a thousand descendants.
4.6★ galaxy30–80h ending50% idle
Little Dig Game
Also planet
A roughly 40-minute game where you send workers onto a planet to gather resources for a company that strips worlds for profit.
4.7★ galaxy
Fundamental
Also pure numbers
Start with a single particle and build up the universe. Galaxy's most-played game by total hours, by a lot.
4.4★ galaxy65% idle
Incremental Mass RewrittenDormant
Also pure numbers
Gain mass, become a black hole, then an atom, then a supernova. The numbers get absurd quickly and never stop.
4.4★ galaxy60% idle