Games Like Cosmos Defense

Expand your fleet, explore your universe, and crush your opponents! Conquest: Frontier Wars features large-scale fleet battles, intelligent admirals who serve as hero units, and pulse-pounding deep space RTS Sci-Fi gameplay!

Why similar: Real-Time 44.7% ★, Strategy 40.2%, Space 13.2%, Singleplayer 1.9%

Nomad Fleet is a RTS game where you must lead the last remnants of Mankind to safety after a mysterious alien race has hunted them near extinction. Lead a fully armed fleet of battleships, carriers and fighters through a series of randomized scenarios and encounters where they must fight for their survival while scavenging for resources,...

Why similar: Real-Time 36.1% ★, Strategy 34.2%, Space 18.3%, Sci-fi 10%, Singleplayer 1.3%

Making your culture shine is often more effective than taking out weapons!

Why similar: Real-Time 38.7% ★, Strategy 37.2%, Space 13.1%, Sci-fi 9.3%, Singleplayer 1.7%

Build a neon fortress in a single-player tower defense campaign. Evolve 15 tower types, lead six commanders, and conquer 20 missions across 10 sectors. Counter armored hordes and towering bosses, then test your defenses in Endless, Boss Rush, and more.

Why similar: Real-Time 36.2% ★, Strategy 23.4%, Tower Defense 23%, Resource Management 11.9%, Sci-fi 4.5%

An incredible asteroid assault is about to begin! Take command of the planet's defenses and prevent extinction in this planetary Tower Defense game.

Why similar: Strategy 53.7%, Tower Defense 25.6%, Space 18.5%, Singleplayer 2.2%

Updated in 2026 for modern systems, Krush Kill 'N Destroy 2: Krossfire is a fast and furious post-apocalyptic real-time strategy game where you have to be quick or be dead. Play as one of three unique factions in the struggle to seek out and conquer oil fields to fuel your army.

Why similar: Real-Time 46.9% ★, Strategy 43.9%, Sci-fi 9.2%

Why be good when you can be... bad? Cursed Treasure 2 is an addictive tower-defense game that puts the power of darkness at your fingertips. Build towers of powerful orcs, demons, and undead, and master powerful spells, to protect your precious hoard from all manner of no-good do-gooders.

Why similar: Tower Defense 33.8%, Real-Time 33.5% ★, Strategy 27.5%, Resource Management 4.3%, Singleplayer 1%

After Earth's downfall, a new planet must now be colonized and defended against attackers. Explore new technologies and revive trade. Settlers, the future lies ahead. Follow me to a better world. May Iridium be with us!

Why similar: Strategy 58.9%, Real-Time 30% ★, Space 11.1%

Space Run Galaxy is the sequel to Space Run, the game from one-man studio Passtech, which seduced hundreds of thousands of players with its dynamic and original gameplay. By twisting the tower-defense game style, Space Run offered an addictive real-time spaceship construction strategy experience.

Why similar: Strategy 42.9%, Tower Defense 38.9%, Space 18.2%

Space Run is a «real-time spaceship construction strategy game». Space Run takes the well-known Tower Defense-style gameplay and twists it, challenging you to manage and protect a spaceship and its cargo against the hazards of deep space!

Why similar: Tower Defense 42.2%, Strategy 26.6%, Space 22.6%, Sci-fi 7.8%, Singleplayer 0.8%

Three thousand years in the future, mankind has carved a bloody path towards domination of the known universe. Self-proclaimed as a divine race and beyond reproach as a species, they view all alien races as inferior.

Why similar: Strategy 58.4%, Space 27.7%, Sci-fi 13.9%

MegaGlest is a 3d real time strategy game with a very strong AI. Single player games and especially multiplayer co-op games are much fun. The game already has a lot of content and it is very easy to make new content, especially new maps.

Why similar: Real-Time 50.7% ★, Strategy 47.4%, Singleplayer 1.9%

A Tower Defense game made in the best tradition with 35 unique towers, 70 upgrades and 8 biomes. A 20 level campaign and 2 challenge levels for now, with more to come! Made by an indie developper.

Why similar: Strategy 63.5%, Tower Defense 33.8%, Singleplayer 2.7%

Phantom Signal is a real-time sci-fi strategy game with unusual mechanics. Explore mysterious star systems and reveal the secret of the phantom signal.

Why similar: Strategy 40.5%, Tower Defense 27.4%, Space 19.4%, Sci-fi 11.4%, Singleplayer 1.3%

Arc defence is a game in genre classic top down 2d tower defense, But in difference of classic TD, enemies can fight back. Use towers upgrades and special abilities to stop waves. Be ready for epic battle and try to protect our lands!

Why similar: Real-Time 35.4% ★, Tower Defense 29.6%, Strategy 24.4%, Space 9.1%, Singleplayer 1.4%

Dig minerals, manufacture ammunition, and build defense towers to fend off swarms of insects. A tower defense game with light production line elements.

Why similar: Strategy 34.5%, Tower Defense 26.4%, Resource Management 14.9%, Sci-fi 11.7%, Space 11.6%

Primordials: Battle of Gods is a pure 1vs1 strategy game where players rule kingdoms and build armies to war for ever greater power. One Will Rise, Many Will Fall.

Why similar: Strategy 69.4%, Real-Time 30.6% ★

Immerse yourself in an epic yet whimsical journey to defend the crystals from hordes of enemies, each more broken-down than the next, with a whole arsenal of tricks! Fight on the plains, mountains, swamps, deserts and many others by adapting your strategy.

Why similar: Strategy 41.8%, Tower Defense 38.8%, Resource Management 16.6%, Singleplayer 2.8%

Lead an armored squad through the perils of this reversed tower defense action-strategy game!

Why similar: Strategy 53%, Tower Defense 33.4%, Sci-fi 11.6%, Singleplayer 1.9%

Want a tactical and strategic tower defense challenge that's packed with options and upgrades? Take command of the dropship Sentinel and do battle across a vibrant sci-fi world.

Why similar: Strategy 52.5%, Tower Defense 29.3%, Sci-fi 18.2%

Play as a giant troll in One Troll Army - a defense game about building forts, upgrading your troll, and fighting off waves of enemies. Play Against The Twitch Chat!

Why similar: Strategy 74.9%, Tower Defense 24.4%, Singleplayer 0.7%

Exclusively brought to Steam for PC, Mac and Linux in Anomaly Bundle, Anomaly Korea is an expansion campaign to Anomaly Warzone Earth. The alien robots are back and this time they’ve got Korea in their sights. It’s your job to lead a squad into fierce fire-fights and fend off the alien invasion.

Why similar: Strategy 60.2%, Tower Defense 28.7%, Sci-fi 10.5%, Singleplayer 0.7%

Colony Siege combines the best of RTS and tower defense, including base building, mazing, and unit physics. Defend Earth's remaining colonies using an arsenal of deadly weapons to torch, slice, throw, and impale swarms of alien invaders.

Why similar: Strategy 50.1%, Tower Defense 23.7%, Real-Time 17.9% ★, Sci-fi 8.3%

Command the realm's last defense in a deep, hand-crafted tower defense. Raise six tower families, lead heroes into battle, and chain elemental reactions into screen-clearing payoffs — across field, mire and graveyard, against towering bosses. 21 levels, Trials, Boss Rush and Endless.

Why similar: Strategy 43%, Real-Time 37.8% ★, Tower Defense 17.6%, Singleplayer 1.6%

Anomaly Warzone Earth Mobile Campaign continues Steam's Anomaly Warzone Earth in an extra 15-level campaign. Originally released on mobile devices, the campaign is brought to Steam for PC, Mac and Linux exclusively in Anomaly Bundle. AWE Mobile Campaign turns tower defense on its head.

Why similar: Strategy 60.8%, Tower Defense 28%, Sci-fi 10%, Singleplayer 1.1%

Defeat hordes of imps in the very first Tower Defence game about the order of monks! All this to defend humankind from hordes of demons!

Why similar: Strategy 53.2%, Tower Defense 46.8%

Space resources are the battleground for warring factions. As a Space Defense Officer, protect your faction's assets in a vast, hostile universe. Allocate resources, upgrade defenses, and repel relentless enemy attacks! With over 50 unique units and deep strategy, experience real-time tower defense!

Why similar: Tower Defense 34.2%, Strategy 26.6%, Space 22.6%, Sci-fi 14.1%, Singleplayer 2.5%

Space Flowers is an intra-galactic tradewars game. Buy and sell flowers as you upgrade your spaceship and explore the galaxy, locating lost family members along the way. Fight off an evil extra-galactic empire when you are ready. Great fun for all ages!

Why similar: Strategy 77.7%, Space 22.3%

Help the plants to defend the garden from being invaded by sneaky beetles.

Why similar: Strategy 69.5%, Tower Defense 30.5%

Defend your empire in a sci-fi tower defense game. Build deadly combinations of railguns, lasers, gravity wells, drones, and cannons across three maps, 50 levels per map, and four difficulty modes.

Why similar: Strategy 39.5%, Tower Defense 30.2%, Space 12.2%, Sci-fi 8.7%, Resource Management 8.3%

Harvest: Massive Encounter is an award-winning real-time strategy game with battles of epic proportions and a unique style of resource management and exploration. Build power plants, mineral harvesters and defense towers and make sure they have sufficient energy to fend off endless hordes of evil aliens.

Why similar: Tower Defense 46.3%, Strategy 43.4%, Sci-fi 8.7%, Singleplayer 1.6%

Rescue the Christmas trees from swarms of ravenous insects.

Why similar: Strategy 74.6%, Tower Defense 25.4%

King of the World is the gameplay from RISK in a Real-time strategy setting. Fight up to 12 players at once while scheming, backstabbing, making shallow alliances or simply conquer to become the last man standing.

Why similar: Strategy 51.8%, Real-Time 48.2% ★

Cursed Cove is an exciting 3D strategic game where players immerse themselves in a dark world of pirates and necromancy. Your task is to capture the enemy tower using an army of skeletons that you can summon.

Why similar: Real-Time 75.7% ★, Strategy 22.7%, Singleplayer 1.7%

Sci-fi tower defense where you create your own maze, manage drones and power levels, and harvest for resources. Upgrade your turrets, buildings and ground units. Upgrade and buy new vehicles and motherships.

Why similar: Tower Defense 41.2%, Strategy 36.7%, Sci-fi 18.8%, Singleplayer 3.3%

Destroy negativity, clear your mind! Particula brings you a new perspective in gaming, helping you to concentrate and relax. A three players co-op tower defense experience with a relaxing soundtrack, smooth visuals and gameplay.

Why similar: Strategy 65.8%, Tower Defense 34.2%

Sci-fi Tower Defense real-time strategy with pleasant adaptive music. Play as a commander of a space station which got stuck in a time anomaly.

Why similar: Strategy 62.3%, Tower Defense 18.1%, Sci-fi 9.3%, Space 8.8%, Singleplayer 1.4%

The ULTIMATE tower defense onslaught is back. Bigger, deadlier, and more action-packed. Build autonomous defenses, deploy tactical drones, and unleash devastating support abilities in this epic, old-school RTS-inspired sci-fi adventure.

Why similar: Real-Time 35.3% ★, Tower Defense 23.9%, Strategy 22.5%, Sci-fi 9.9%, Space 7.1%

DangerSpace is a blend of thrilling space sim and tense RTS gameplay. The deliciously heavyweight, physics-driven flight engine gives a new gaming experience.

Why similar: Strategy 39.1%, Real-Time 34.4% ★, Space 17.4%, Sci-fi 7.6%, Singleplayer 1.5%

Anomaly 2 is a sequel to the critically acclaimed Anomaly Warzone Earth. Maintaining the core elements of the original, Anomaly 2 adds plenty of new features: unit morphing, over million tactical combinations, post-apo world and tower defense vs tower offense multiplayer mode.

Why similar: Strategy 52.3%, Tower Defense 36.6%, Sci-fi 9.7%, Singleplayer 1.4%

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.

Why similar: Tower Defense 30.7%, Strategy 24.5%, Space 17.1%, Resource Management 16.7%, Sci-fi 10.4%

Fantasy Tower Defense is a challenging, fast-paced, and strategic Tower Defense game where you frantically build towers, cast spells, and upgrade to stop monsters from reaching your castle.

Why similar: Strategy 56.4%, Tower Defense 40.7%, Singleplayer 2.9%

Guide one of 12 races on their first interstellar journey from a single planet, until it becomes a mighty pan-galactic empire.

Why similar: Strategy 81.4%, Sci-fi 18.6%

Aegis of Earth: Protonovus Assault is a frenetic and explosive new spin on action strategy gaming. Plan out and build up your defenses as hordes of hulking monstrosities bombard your heavily fortified city in an attempt to wipe you off the Earth for good!

Why similar: Strategy 61%, Tower Defense 39%

Aeon Command is a tug of war strategy game, where you play as one of three unique factions to help gain dominance over the Aeon Nebula! Take control of your mother ship to gather resources, produce ships and fight off the enemy mother ship. Grow stronger as you progress through the 24 mission campaign and unlock new upgrades.

Why similar: Strategy 68.3%, Space 19.7%, Sci-fi 11.9%

A sci-fi real-time strategy game. An existential war among asteroids in classic RTS style. Build and defend, produce and upgrade, attack and annihilate!

Why similar: Real-Time 41.6% ★, Strategy 20.3%, Space 17%, Resource Management 10.2%, Sci-fi 9.4%

In this game of medieval diplomacy, treachery & power. To win you must survive. To survive you must scout the surrounding territories, defeat the local militias, subjugate the land with castles, feed the people, forge diplomatic alliances, appease the church and unite the land under your iron fist.

Why similar: Strategy 49.6%, Real-Time 38.6% ★, Resource Management 11.8%

Defend your data servers from viral corruption in Data Defense - a minimalist tower defense set in cyberspace.

Why similar: Strategy 43%, Real-Time 36.6% ★, Tower Defense 20.4%

Spaceships and Cellular Automata is a tower defense game set in space! Place different towers to defend your ship against the waves of aliens. The enemies are simulated based on Conway's Game of Life. Even just one of your bullets is enough to cause a destabilizing chain reaction to destroy them!

Why similar: Tower Defense 35.5%, Strategy 33.9%, Space 22.4%, Sci-fi 7%, Singleplayer 1.2%

Astral Ooze is a sci-fi realtime strategy game. Your astral ooze generates over time for every controlled star. Expand your astral ooze and conquer the stars!

Why similar: Real-Time 56.9% ★, Strategy 23.1%, Space 17.8%, Singleplayer 2.2%

Defend the kingdom against waves of orcs, build and upgrade towers, gather loot, and create powerful elemental combinations. Conquer increasingly difficult maps, develop your strategy, and prove how long you can hold out in endless mode.

Why similar: Strategy 35.9%, Tower Defense 34.3%, Real-Time 21% ★, Resource Management 7.4%, Singleplayer 1.4%

ENDLESS Space™ 2 is a Strategic Space Opera, featuring the compelling “just one more turn” gameplay, set in the mysterious ENDLESS Universe™. As the leader of your civilization, will you impose your vision and build the greatest stellar empire?

Why similar: Strategy 92.1%, Space 5.7%, Sci-fi 2%, Singleplayer 0.1%

Power Of Defense provides a new strategy and defense mix game experience. Defend your world from upcoming evil and oil-smelling robots. They come from the platform between both parallel universes you have to fight on by producing own robots to send them back to their native world.

Why similar: Strategy 67.9%, Tower Defense 32.1%

We invite you to join a trip to little islands of jolly forms. We will be thankful to you, the great strategist, if you help us to get rid of gluttonous rabbits.

Why similar: Strategy 64.8%, Tower Defense 35.2%

Bots Rush is a unique mix of Tower Defense and logistic puzzle. You will find a set of interesting and complicated game levels, original enemies. Your task is simply to build a network of roads to deliver resources to factories and ammo to towers. Sounds easy, right? Lets check this out.

Why similar: Strategy 57.9%, Tower Defense 42.1%

Tower defense offline game with many defense strategies. Gem of TD games

Why similar: Strategy 71.6%, Tower Defense 19.2%, Sci-fi 9.2%