Top similar games like Firefly Online Cortex:

Pilot your ship in the seamless open world made of space, planets, and more. Find new ships and equipment, find allies and beat all the enemies in this open source space shooter!

You are sitting on a toilet when you are abducted and beamed up to an alien spaceship, where you have to convince an A.I. that you really are an intelligent lifeform.

This is a machine girl themed air combat action role-playing game. In the world of Nornium, you can experience ARPG cosmic air combat and its Rougelike variants, manipulate the "Time Tree" to jump around in parallel time and space at will, or enjoy a leisurely slow life in the presidential suite.

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!

Ring Runner combines the fast-paced action of space combat with the rich story and skill variety of an RPG.Trek across the universe in a 30 hour long story-driven campaign based on a companion Sci Fi novel, or challenge 6 scenarios alone, cooperatively, or competitively through local or online multiplayer.

Scavenge modules, combine them in the deadliest and most efficient ways imaginable, and fly your very own spaceship through alien space with BossConstructor. Thousands of procedurally generated galaxies await you and your space-faring collection of assembled modules to explore them.

The Long Journey Home combines an open world full of galaxies, planets and anomalies with quests and mechanics of a rogue-like RPG. One destination. Endless adventures. Where will this journey take you?

Shadow Corps is a turn-based tactics game where you command a squad of elite soldiers on a mission to stop an ancient danger. Fight your way across the galaxy, craft and equip your troopers with cutting edge gear and use cunning tactics to defeat your foes. Are you ready to take command?

Crazy fun rocket simulator game with countryballs theme. Can Polandball into Space? Try to find out!

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.

Titan Outpost is a hard science fiction role-playing game in which you must build a base, manage its crew, develop your character's skills and attributes, and explore Saturn's sixth moon, uncovering its mysteries and harvesting its resources.​

Drox Operative 2 is a starship action RPG with warring alien races, fierce space battles, a dynamic, evolving galaxy, and co-op multiplayer for Windows and Linux.

This is a rogue-like top-down shooter where you control a spaceship that is sent out to explore the caves on the Moon. Once you enter the caves, you find out that there are enemies. It is up to you to survive against them while also trying to find the path down to the next level of the caves.

A relaxing strategy game featuring unconventional gameplay. Your objectives include development, evolution, border expansion and protection of your hive.

There is a quarantine declared throughout the orbit so all the pilots are grounded except for the few ones allowed to participate in training battles. Join their ranks for blazing fast space battles with another players in this top-down shooter game

Cosmonator is an 'RPG-em-up': a hybrid of classic fast-paced top-down shoot-em-up action infused with deep character building elements. Build up your own unique alien-killing machine to avenge the destruction of planet Earth!

Atomic Heist is a sci-fi roguelike twin-stick shooter. Control your combat ship and fight your way out of the overrun space station. The nuclear core you have to steal is leaking radiation, so you need to hurry and escape! Manage your ammo carefully and collect power-ups to enhance your ship.

Landinar: Into the Void is a top-down space-adventure-RPG. You are recruited as a rookie bounty hunter in the oppressive Landinar Empire. On your journey through the quadrant you will meet diverse characters, build your own spaceship and choose your battles.

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.

Starship Empire is an intense PvP-filled space MMO where you not only lead your ship into epic battles, but manage the entire crew inside!

Deep Sky Derelicts is an original combination of turn-based strategy and RPG, enriched with tactical card combat and popular roguelike elements. Explore derelict alien ships, fight, loot and upgrade your gear, all in distinctive retro-futuristic comic book aesthetic style.

Naev is a game about space exploration, trade and combat. Players travel the galaxy and earn money by trading, fighting and performing missions.

Gears of Eden is an indie space game set in the distant future featuring a story-driven adventure that includes open-world exploration, crafting and missions. Take control of a sentient machine and search for answers to your origin as you mine, craft, and explore!

Zigfrak is a space-based action RPG, featuring missions, exploration, and crafting. With an emphasis on loot and over-the-top items, it's not a traditional space sim. Enemy ships explode like loot piñatas, spewing forth useful pickups.Try the free demo first, you'll hate it! https://store.steampowered.

Cube Universe is a first-person voxel RPG. Visit many different, procedurally generated planets. Team up with your friends to fight against fierce enemies in dungeons. Do quests to save the world from the forces of evil - or throw it into chaos.

Spacebourne is an open space exploration game with Rpg elements. Its world consists of different factions at war. You as an expert pilot need to choose your side or be on no one's side and create a force of your own. Load up your weapons, Ready your ship and warp to adventure.

Gangs of Space is a massively-multiplayer Rogue Shmup where Gangs of players compete for the conquest of the galaxy.

Take on the role of Nora Harwood, member of Everreach’s Security Division, on a mission to secure the colonization process of Eden and investigate mysterious incidents! Everreach: Project Eden is a fast-paced, story-driven action-RPG set on the visually stunning Planet Eden.