Top similar games like Colony Siege:

After the destruction of the EARTH in 2150, the leaders of the Eurasian Dynasty escaped on board an evacuation fleet. Now they are fighting for the survival of the human species. Their base is one large building comprising of smaller variable parts.

A desolate realm, kept in flux by the rhythm of battle. A proving ground for those with great ambition. A Year Of Rain is the ultimate team real-time strategy game. Choose your faction, team up and take control of a legendary hero to lead your armies!

The enemy attack on your base is imminent; secure your defenses, mobilize your troops, reinforce key positions, and get ready for the next battle. RTS Tactical Warfare will test your resilience and strategic prowess.

Creeper World 3 is what happens when cellular automata takes over a strategy simulation. Instead of discrete units that attack your base, a fluid-like substance spreads over the terraformable terrain. Your base, your weapons, your strategy... you must adapt them all.

From the Command & Conquer veterans at Petroglyph comes the first ever survival RTS set in the savage world of Conan the Barbarian. Play solo or team up in multiplayer in Conan Unconquered’s action-packed co-op Mode where you build a shared stronghold and fend off the hordes together.

With 100+ truly unique units, Zero-K is an RTS of freedom and creativity, tempered by a decade of refinement. Sculpt land into a castle and throw invaders off it with a Jugglenaut. Explore a massive campaign, solo or co-op. Hop online for epic 32 player battles or fast paced 1v1, on 100s of maps.

The desperate leadership of a doomed Soviet Union travels back in time to change history and restore the glory of Mother Russia.

DwarfHeim is a class-based co-op RTS for 1-3 players. Survive against endless waves of trolls either alone or with friends, defeat enemy clans in Multiplayer Conquest, or build your Dwarven settlement in Sandbox mode.

The most devious and acclaimed artificial intelligence in strategy gaming is better than ever. A grand strategy/RTS hybrid that reverses many conventions of both genres. Take territory without attracting attention, build your empire with care, and adapt to an ever-evolving galactic battleground.

Halo Wars: Definitive Edition is an enhanced version of the real-time strategy classic, Halo Wars, updated to run natively on PC. Halo Wars: Definitive Edition includes improved graphics, new achievements and all of the DLC created for the landmark real-time strategy game.

{{An RTS inspired by the classics of the past!}} Making up for it's subpar retro graphics with fun gameplay and modern multi-threaded tech enabling huge battles to run smooth... Featuring singleplayer challenges, skirmish, sandbox, 10-player multiplayer & workshop modding.

Raft™ throws you and your friends into an epic oceanic adventure! Alone or together, players battle to survive a perilous voyage across a vast sea! Gather debris, scavenge reefs and build your own floating home, but be wary of the man-eating sharks!

UNITED COMMAND is a military base building real time strategy game with a 2 player co-op campaign. Drop into a mission and fight side by side with a friend against the enemy AI. Use your dozer to build out your base and gather resources to fund the construction of your tanks, infantry, and aircraft.

Microsoft Studios brings you three epic Age of Empires III games in one monumental collection for the first time.

Wage war across entire solar systems with massive armies at your command. Annihilate enemy forces with world-shattering TITAN-class units, and demolish planets with massive super weapons!

The last days of man are at hand.. Two years after the Infinite War the once great warring nations now lie in ruins, and humanity’s hope for a brighter future is nothing but a bitter memory. A new, seemingly unstoppable enemy, supported by the zealots of The Order, now seeks to eradicate mankind: UEF, Aeon Loyalist, and Cybran alike.

Act of Aggression – Reboot Edition brings the techno-thriller RTS game Act of Aggression to a higher level. The Reboot Edition offers a full gameplay overhaul in skirmish mode against the AI and in your multiplayer battles.

Xeno Conflict is a real-time strategic survival game based on a future background, where players can control different factions compete and cooperate with each other to fight against unknown biological environments.

Desynced is a sci-fi strategy game with fully customizable units and behaviors. Gather, build, research, and explore the unknown. Alone or with friends, unveil the mystery of an AI on the edge of self-awareness and uncover the hidden truth in this blend of strategy, automation, and exploration.

Stellarcraft is an exciting sci-fi tower defense game where you explore planets, gather resources, and fend off enemies—solo or in 4-player co-op. 🚀

Inspired by modern science fiction! A modern real-time war game, the screen is in the style of realism, the fast-paced attack effect is easy to fatigue, easy to use and simple to operate, mainly in the traditional style

Includes 47 Steam achievements, leaderboards, and stats!

Astro World is a side-scrolling co-op game where the players will have to build their colony on a planet full of danger, valuable resources and alien artifacts, using which the player can explore new technologies and equipment to arm their colonists with.

The third and final expansion to the genre-defining and critically-acclaimed RTS, Dawn of War. In Soulstorm, two new armies are introduced – Sisters of Battle and Dark Eldar - raising the total number of playable armies to nine.

"You are outgunned. You are massively outnumbered. You must win." These are your orders. Humanity has already fought its war against the machines -- and lost. AI death squads stand watch over every planet and every wormhole, the few remaining human settlements are held captive in orbiting bubbles, and the AIs have turned their...

Executive Assault is an indie real-time strategy/first-person shooter where you can not only build your base and create armies, but also take control of your units and fight as one of them.

An open-ended factory management game with RTS and tower defense elements.

Sanctum 2 is the sequel to the world’s first Tower Defense/FPS hybrid game. Pick from four unique character classes and embark on a mission to protect the oxygen-producing Cores from hordes of deadly aliens who are threatened by their existence.

Embark on an unforgettable journey with your friends around the world in an eco-friendly adventure made specifically for a group of up to 4 people. After the apocalypse due to global warming, the characters realized that in order to survive, they would have to gather in a team and recycle garbage.

Make Mars your own! Take control of the world’s most sophisticated AI (AMI) and terraform the surface of the Red Planet for a city-building experience on a planetary scale. Transform this barren world into a lush paradise and explore the surface for any ancient secrets that may be waiting.

You think Tower Defense games are all about building? You thought wrong. Sanctum is not your average Tower Defense title. When the havoc starts, you get to join the fray! As one of the world’s first First Person Shooter - Tower Defense games, Sanctum has taken the best of both worlds to deliver an epic, one-of-a-kind experience.

Bunker Defense is a tower defense game for 1-4 players. Waves of enemies attack your base, and you must defend it by building different kinds of defenses.

Experience the ultimate WWII RTS platform with COH2 and its standalone expansions. This package includes the base game, which you can then upgrade by purchasing The Western Front Armies, Ardennes Assault and/or The British Forces. More info in the "About This Game" section below.

A classic real-time strategy game with an epic single player campaign, multiplayer & coop, set in the alternate reality of 1920+