Top similar games like 20 Days:

The Fermi Paradox is a choice-driven sci-fi narrative strategy game in which your decisions in one corner of the galaxy can upend entire civilizations in another. Guide species through millennia and help them explore the vastness of space, make contact and, perhaps, create harmony.

MatchyGotchy Z is a colorful digital pet game that combines idle clicker elements with a new take on pet-raising simulation: trainable personalities. All the nostalgia of those old virtual pets, fully adapted into a new desktop gaming experience.

Space Colonizers is a simulation and strategy idle game of Sci-Fi adventure theme. To explore more planets and meet cute aliens, you have to constantly install parts and upgrade spacecraft.

Embrace the call of the cosmos! Take the helm as a fearless Soviet space explorer. Explore, trade, defend and manage your fleet while meeting a diverse array of interesting aliens.

A chaotic incremental mining game where a single swing scales into screen-clearing mayhem! Smash planetary quotas to unlock advanced tools, deploy helper bots, and invest in a massive skill tree. Trigger devastating proc combos and break your efficiency wide open.

An idle incremental adventure in space! Mine asteroids while fighting off enemy AI drones. Build your own AI drones, mining lasers, helper drones and more. Collect hundreds of rewards and unlock a variety of features that will help your ultimate goal: making numbers go up (or sometimes down).

Board your ship and push the boundaries of space exploration in this contemplative space incremental. Gather resources, develop your technology, and travel from the Moon to the edge of the solar system to answer a mysterious signal from the stars.

A sci-fi themed incremental game which allows you to expand your capitalistic empire across the galaxy! Hire mercenaries to pillage alien planets for resources, with the singular goal of making as much money as possible as quickly as possible! Totally not a playful commentary on real Terran society.

This sci-fi adventure brings you to command stations in the far corners of space. Casually make decisions and watch how well you can balance the needs of your station.

Sublunar is a Sci-fi, Puzzle, Strategy game, where the goal is to convert settlements over to your faction, by performing missions and strategic upgrades, while fending off bandits and subsiding revolts.

Endless Sky is a 2D space trading and combat game inspired by the classic Escape Velocity series. Work your way up from a relatively wimpy shuttle, cargo ship, or fighter, to a highly upgraded and customized flagship or to a massive fleet of warships or freighters.

You were chosen for the Planet Keeper Program. Defend the planet in this retro-inspired incremental game. Upgrade our defenses, destroy our enemies, ensure our future.

Enter the ambient world of Osmos: elegant, physics-based gameplay, dreamlike visuals, and a minimalist, electronic soundtrack. Your objective is to grow by absorbing other motes. Propel yourself by ejecting matter behind you. But be wise: ejecting matter also shrinks you. Relax - good things come to those who wait.

Will you use the gravity of the planet or jump through a black hole? It’s up to you. Set an angle, speed and just watch how unsuspecting colonists fly through the space hoping, that they won’t end up flat as a pancake on some meteorite. Puzzle game with unique story will put your brain to the test.

A 2D side-scrolling sandbox survival game featuring pure random exploration and mining. Mine, gather, study alien life, and build bases. Battle harsh environments and rival alien miners. Embrace unpredictable roguelike survival challenges in an infinitely generated universe.

Crack gem-studded asteroids in this incremental space-mining game. You steer while your lasers do the mining. Clear the field and a richer wave rolls in. Chase comets, dodge black holes, then grow a skill tree, draw talents, build guns and go deeper.

Lightracer Spark is a Sci-Fi Narrative game. You are an amender from a high civilization, descending to various extraterrestrial worlds. Guide living beings to prosperity, or nip a spark in the bud. Accumulate strength through choices and strategies to grasp the rise and fall of all civilizations.

‘Space Squad’ is a top-down space shooting survival game. Protect your central circular base and aim at enemies with your mouse. Earn skill points by defeating enemies to unlock various abilities. Face waves of incoming enemies and do your best to survive.

Will you help the Emperor get re-elected, or will you just straight-up start a rebellion? It's up to you to decide in this political ballgame.

Civilization was born from a chaotic star system and has been constantly tested in its development, from ancient civilizations to occupying the entire galaxy, which is long and dangerous.

Galactic Simulator 3 is a space exploration and evolution sim inspired by the Fermi Paradox and Great Filter theory. Scan uncharted star systems, gather resources and samples, establish outposts and stargates, and witness the rise and fall of civilizations across an ever-evolving galaxy.

The Helios Accord is a post-scarcity science-fiction grand strategy game. Govern by consent, set doctrine, negotiate with civilizations, and send Citizen Minds beyond known space. Then Serenity of Dawn disappears. No wreckage. No distress call. Only an impossible signal that changes when observed.

Meet some aliens, make some money, and save the galaxy while you're at it!

Destroy Aliens, earn Stars, upgrade EVERYTHING. Blast enemies, power up your ship, unlock stronger aliens, and watch your Stars soar.

A text-based, choice-driven adventure. Intrigue, trust, loyalty, luck, reflex... How high a position can you achieve in this medieval world?

MatchyGotchy is a casual idle clicker game full of childlike wonder. Introducing characters from the Matchy Star world, collect them all as digital pets and build thousands of ships to reach Xanadu. Get your virtual Stars that intergalactic pool party they always wanted!

Tasked with commanding of one of the most challenging sectors of the galaxy, the future of the Alexandria IV space station depends on your diplomatic and strategic capabilities. How far will you go to prevent a war? A space opera visual novel by J.M. Beraldo.

Create a Company, Build structures, Collect Resources, Make Investments and Speculate on Assets. Carefully manage your Workforce, Finances, Resources, Shareholders, BOD & Political Partnerships.

Real-time strategy battles in amazing sci-fi worlds! Command brave soldiers, mighty mechas and powerful aliens to face the greatest challenges in hostile alien worlds. The galaxy needs you!

Defend your station with a click and survive as long as you can. Destroy the enemies, mine the deposit, then trade your ore for permanent upgrades. Every world has its own ore, its own enemies and its own rules.

Add Astra is a math game about racing, and a racing game about math, developed by Coincidence. You’re the best arithmetech racer on Earth. But what about everywhere else?

Lines We Draw is a 3D isometric narrative strategy game set at a tense Cold War border. Inspect documents, interrogate travelers, and manage a shifting checkpoint between rival states. Your stamp decides fates: Will you be a hero of the people, or a tool of the regime?

Build a retro-industrial space program, manage your launch base, assemble and upgrade the Columbiad, then manually guide each mission through atmospheric ascent, orbital insertion, lunar transfer, and recovery in a low-poly spaceflight management adventure.

"Space Lot" is a cosmic-themed slot x incremental x roguelite game. Expand your grid up to 9x7, trigger explosive symbol combos, and aim for endless cosmic expansion (level up)! If you run out of spins, the "Big Crunch (cosmic collapse)" awaits.