Top similar games like Octodefense:

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!

Spectral Realm is a top-down tower defense Rogue game, where players need to play the role of an astronaut who has just landed on a different planet to block a constant stream of attacking native creatures and continuously strengthen themselves with the gems contained within their bodies.

Grav Blazer is an arcade space shooter with a focus on fast paced action. Skill based firing mechanics, rotational controlled power attacks, increasing level difficulty, and endless procedurally generated levels are some of the features players will experience.

Heroes Rally is a casual strategy tower defense game. Build towers with different characteristics and command heroes to repel all the enemies. Go and develop a your unique and powerful strategy!

2D-isometric game with a lot of action and sci-fi narrative. Play with and switch between three characters: Kit - the girl, Che - the ape and Moses - the alien, as they explode as many droids as possible!

Star Merc is an open world rpg where player choices heavily affect outcomes and drastically change the storyline. The game is about exploring different planets, learning about the inhabitants and dealing with the different factions that like to think they control the universe.

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!

Navigate the beauty and hazards of the solar system while riding a wave of light through 100+ levels in this innovative action-puzzle game!

Two kingdoms in battle against each other, the king Bennevert called for the legendary mighty mercenaries to defend strategic posts in dangerous lands in the battlefield. Are you prepared to be a mercenary?

Defense Grid: The Awakening is a unique spin on tower defense gameplay that will appeal to players of all skill levels. A horde of enemies is invading, and it's up to the player to stop them by strategically building fortification towers around their base.

Bumper Blitz TD redefines tower defense with gravity-powered physics and dynamic gameplay. Build, upgrade, and bounce enemies away in this thrilling fusion of strategy and action!

A 2D top-down space shooter where you complete different missions, collect resources, fight dangerous enemies, and upgrade your ship with new weapons and parts.

Fight off hordes of monstrous mutants created from a strange cataclysmic event in the new tower defense game, Prime World: Defenders. Join a group of exile treasure hunters who have ventured into the capital of an ancient empire, vast with mystery and danger.

A cosmic survivors-like where every upgrade brings you closer to becoming a living superweapon. Burn through alien hordes, rupture pocket dimensions, escape black holes, and survive the cosmic war for the Moon.

Chuck space aliens into each other! Dodge giant asteroids! Engage your tractor beam, force field and phase shifting technology to navigate the unknown in this 2D side scrolling physics based space adventure. 

Still reeling from the life-changing events of the previous episode, Gail seeks out a safe haven with her father in the Delta Pavonis system. However, she soon learns that the politics of Planet Leto can be as treacherous and unpredictable as the local weather.

Pilot the last vessel of a fallen civilization into the vast expanse of space. Collect resources and search for a new world to call home in this minimalist space exploration and survival game.

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.

Fight fierce hostile alien space ships to neutralize their defenses before you board their ships and battle intense on-foot encounters. Eliminate their forces and steal their technology to upgrade your squad with different abilities and save the galaxy!

Bob hired an AI to look after his house. You are that AI. Pilot a combat ship, survive waves, deploy defenses, and turn a world-hopping planet into an orbital fortress in this planetary-defense action roguelite.

Get ready for an epic journey to defend your kingdom against hordes of orcs, trolls, evil wizards and other nasty fiends using a vast arsenal of towers and spells at your command!Fight on forests, mountains and wastelands, customizing your defensive strategy with different tower upgrades and specializations!

Last Star is a space shooter roguelite with tower defense elements. Pilot a spaceship to protect your solar core from endless waves of alien invaders. Upgrade both your core and spaceship to become unstoppable. Execute tactical counterattacks against alien motherships to slow down the invasion.

Find the pieces to discover and to travel in the Solar System! 45 jigsaw puzzles and in game achievements for an adventure in the middle of the stars!

A co-op sci-fi featuring scrap, piracy, and your talkative line manager Clara.

Faith & Shield: 4044 Tower Defense game, where you protect the human settlement from the incoming invaders, robots and other creatures, never seen before on our planet.

Jetboy is a retro supercharged jetpacking pixel shooter with a pumping metal soundtrack.

Become a space mining astronaut in this chill rogue-lite mining game. Explore, mine and complete objectives while unlocking and upgrading your equipment along the way.

Ancient Greece under siege. Steam engines roar, bronze towers rise, and waves of soldiers and machines march against you.

Super Sanctum TD is a retro-styled Tower Defense game that focuses on strategy, customization and replayability. Build advanced mazes and construct powerful towers to prevent alien hordes from reaching the Core!

Grav Blazer is an arcade space shooter with a focus on fast paced action. Skill based firing mechanics, rotational controlled power attacks, increasing level difficulty, and endless procedurally generated levels are some of the features players will experience.

An atmospheric narrative-platformer about a service robot stranded on a mysterious planet, Planet of the Eyes features a stunning visual mix of puzzle and platforming challenges, an original musical score, and fully voiced audio logs left by another survivor. Explore the mystery of an unknown world.

Star Devil is a Sci-fi Station Survival Roguelike Game with dynamic alien infection. Playable in both single player and split-screen co-op.

Defender's Squad is a sci-fi vertical scrolling shooter 2D that combines 7 different levels. Play Solo and pick one of the 3 ships to kill enemies and save the earth from aliens.

While your ship battles enemies on autopilot, your mission is to keep upgrading it with strategic cards. In this experience that values brains over reflexes, the right upgrades are the key to victory!

Embark on an adventure with Loot Express Delivery Service, a 2D pixel art game. As the commander, your goal is to retrieve valuable items from a distant planet. Utilize your skills and strategy to complete missions and guide your company to prosperity.