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.

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.

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.

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.

The debt is a trap. DEBRISVERSE is a sci-fi incremental sim where you crush space debris for profit. Use roguelite upgrades to accelerate destruction and pay off your $100M debt. But this perfect workplace has a dark secret. Uncover the system's conspiracy across 7 unique endings.

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.

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.

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.

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!

Forgotten Stars is a tactical RPG where you recruit your own crew of space pirates. Plunder your opponents, build bonds with your crew, and embark on your journey through the darkest corners of space.

You are the newly appointed Judge in the Stone Age trying to keep a chaotic island from falling apart. Listen to bizarre testimonies while balancing absurd laws and deadly politics. Pass judgment, shape the island's fate, and uncover the truth behind your father's mysterious disappearance.

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!

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?

"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.

Mini Gal4Xy is a light strategy game set in space.

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.

Lazy Galaxy 2 is an idle/clicker game with base-building and RTS elements. Lead an evil (albeit lazy) alien race to conquer the universe! Expand your base, fight vicious foes, and conquer the galaxies. Acquire combat experience and convert into candy, the most precious alien resource!

Embark on an interstellar journey with Galaxy Idle Clicker! Conquer galaxies, upgrade your spaceship, and face off against a myriad of enemy ships. With engaging minigames, powerful upgrades, GIC delivers an unparalleled idle space adventure. Join the cosmic conquest today and dominate the universe!

The Rebel Space Admiral is an idler/ clicker game about space exploration with battles, trade, base building, planet invasions and science research. Fight your way through hundreds of star systems, meet aliens, find powerful artifacts and defeat an ancient evil before it purges the galaxy.

Beware Planet Earth! is a beguiling mix of classic tower defense and time management coming to PC via Steam for the first time. Save your cows from the Martian invasion by building an effective defense using towers, traps and objects, and also by firing your Zapper directly at the invading force of little green men!

You are the Evil Emperor's only daughter, but can you claim the throne? Raise stats, make deals, appoint advisors, and scheme your way through the Imperial Election - unless an assassin gets you first. Rule the galaxy or die trying!

Amidst powerful alien empires, you are among the first humans in this corner of the procedurally generated galaxy. Trade and explore. With no combat, your success hinges on mastering complex alien economies and navigating intricate politics. Can you carve out a place for humanity in the cosmos?