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.

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).

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.

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.

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!

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!

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.

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

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!

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?

Mini Gal4Xy is a light strategy game set in space.

Dig deep, manage workers, research tech, and face quantum mysteries in this terminal style incremental mining game.

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.

Dreams can bring back what you’ve lost… or bind you to it forever. REM is a point-and-click adventure with cinematic visuals, an emotional story, puzzles, and multiple endings shaped by your choices.

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?

A Strategic Empire Collapser. As The Authority. Manage a living galaxy, and plan large-scale actions according to your needs. Collapse governments, inflame rebellions, seed new factions, and sacrifice your own. All for purposes grander than any Empire could hold.

In this 2D ARPG,you will play as a human who has been kidnapped by alien poachers. After being rescued by the Galactic Animal Protection Organization, you choose to join and embark on an adventure across the galaxy.

Rebel Galaxy is a swashbuckling space adventure, with action-packed combat, exploration, discovery, trade, and “negotiation” with the outlandish denizens at the edge of the known universe.

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.

You are in command of the human fleet, searching for asteroids to mine, extract resources and build bases and more ships to defeat aliens invaders. This simple and short action RTS has a full and exciting campaign, and a skirmish mode that allows you to play a different mission on every match.

We have built a mini universe with real physics basis, simulation and imagination. The game uses realistic environments and models to tell a story of a mini universe.

An extremely difficult strategy game focused on stealth mode. Your objective is to lead the cows on their escape through the spaceship. Go from hiding to hiding so as not to be seen by the aliens and be patient with the granny cow. Are you qualified to fulfill this mission?

A Cosmic twist on a Suika-style game with space gravity. Help our little friend Sputnik on his journey to become the Sun.

CyberHive is a strategic space travel simulator with a non-linear story, in the cosmic opera setting, and in an anime visual style.

This is a simple simulator that simulates the formation of life through simple physical rules. Here, you can define different balls with physical properties, let them affect each other, and then form something similar to life. !!! If you want to restart, click the settings button and click Play!!!