Top similar games like Cyber Siege:

HELLDIVERS™ is a hardcore, cooperative, twin stick shooter. As part of the elite unit called the HELLDIVERS, players must work together to protect SUPER EARTH and defeat the enemies of mankind in an intense intergalactic war.

SCHAR: Blue Shield Alliance is a cooperative twin-stick shooter that features a variety of complementing ship classes to choose from. Upgrade your ships, defeat hundreds of enemies, save the galaxy all with some friends from the comfort of your couch.

Co-op salvage raids for one to four pilots, on one couch or online. Beams link your ships and shred anything they sweep: spread out and swing the web. Crossfire, dodge, revive your crew from escape pods, and build a salvaged ship that breaks the rules, three sectors and three guardians deep.

Pilot your fully customizable Arsenal mech and join your fellow mercenaries in defending humanity from the corrupted machines and gigantic robots in this post-apocalyptic action game!

Blast your way through enemy lines to defeat Inferno, a madman intent on global domination. Destruction just got awesome.

Choose your ship and command it against an army pitted against you in this wave-based arcade-style bullet hell space shooter. Fight for as long as you can with powerups acquired through the catalog, and blast through everything in your path.

At Sundown: Shots in the Dark is a fast-paced PvP twin-stick shooter where you can't see who's lurking in the shadows. With 12 light-powered weapons to choose from, sneak and shoot in the dark for the ultimate kill!

Grab your friends and build and fly your own customisable spaceship. With local and online co-op customise your spacecraft with a wide variety of components, you must work together to figure out the best way to survive your journey!

Fight through a sci-fi campaign or battle friends in 4-player local multiplayer. Pilot powerful tanks and mechs, unlock devastating weapons, rescue survivors, and destroy relentless alien hordes in this fast-paced top-down twin-stick shooter.

Ultra Mega Planet Battles is an intense arcade-style, space-based, twin-stick shooter. Players can play by themselves, or with up to 3 friends local co-op or Steam Remote Play (total of 4 players). Select your character, select and modify your ship, then get shooting!

HELLFRONT is an intense top-down shooter. Conquer ground, build a base, and command your troops in battle! Play PvP or beat the campaign co-op or solo.

Enter the cockpit of your spaceship and prevent the destruction of our homeland! You and your friends have to dodge various attacks and fight many enemies. But your Twitch chat can support you in your defense and your subscribers can even accompany you as wingmen!

Halo: Spartan Assault brings the excitement of Halo combat to Steam for the very first time. Battle your way through 30 action-packed missions against the Covenant as you explore the origin of the Spartan Ops program featured in Halo 4. *DirectX feature level 10 required. *

ZERONE is a PC-based high-quality VR game, and it is a Hyper FPS game that competes with the enemy units of the mechanic series.

Quick mech battle for two players. Choose weapons, explore the map and destroy your opponent.

Nova wing a fast scrolling space shooter for up to 2 players. Fly through the many levels defeating the many swarms of aliens, Bosses and other assorted defences. Collect energy from the defeated aliens to help upgrade your own ship.

Astrotoons is a party-shooter offering both co-op and PvP modes up to four players. Cooperate with friends to complete missions and escape, or compete against each other in exciting PvP matches.

Livelock is a co-operative top-down shooter where you play solo or with up to two allies to break the cycle of infinite war between machines. As one of the remaining Capital Intellects, your role is to unlock Eden and revive humanity.

Layer Section, the home console port of arcade game RayForce is back with new features and online ranking. Use the new lock-on laser function to defeat multiple enemies at once for a higher score in this gorgeous 2D vertical shooting game!

A fast-paced top-down mecha shooter with fully destructible environments and light stealth elements. Pilot a mech and engage in unrestricted collateral damage!

In Deadline: Aphelion, you play as a mercenary tasked with defending the research facility from the hordes of alien spiders that have been drawn to it. 

- Co-op Twin Stick Shooter

Pulsar Crash a 2D twin-stick shooter which throws you into head-to-head space battles where the competitive spirit of fighting games meets bullet-hell chaos.

A dark future hangs above you. In this strategic rail shooter viewed from below, fights unfold between rival gangs in suspended tramways. Positioning is survival.

Nex Machina is an intense arcade style twin-stick shooter from Housemarque. Taking hints from both Robotron and Smash TV, Nex Machina focuses on pure action, voxel destruction and competition in the distant, cablepunk themed future.

A new threat arises! Will you stand up and protect the planet?It’s time to SUIT UP, survive an alien invasion and protect your loved ones in a world where Wave Survival, Twin Stick Shooters, RPG and Roguelite come together in one epic mashup!

A sci-fi twin stick shooter stripped down to the bare essentials with focus on smooth controls and satisfying action.

Fast-paced top down shooter. Single player or 2-4 players in local multiplayer / co-op. Sci-fi setting. 3D physics makes the gameplay more dynamic / immersive than traditional 2D shooters. Varied weapons, enemies and interactive environments. All set to a pounding rock / electronica score.

Frantic 4-player laser ricocheting top-down shooter. Keep it casual and enjoy the chaos, or master the surprisingly deep mechanics to obliterate your enemies. Duke it out locally in free-for-all or 2v2.

KosmoSquad is a twin-stick arena shooter where you survive as long as you can against an ever-increasing hoard of enemies. Fight alone or with up to three friends and collect star multipliers to maximize your high score. Use your score points to purchase upgrades for your ship and try again!

Assault Android Cactus is an intense arcade style twin stick shooter - pick from one of nine unique synthetic heroines and blast your way through overwhelming robots hordes to save the ship from its own workforce. Supports single player and local co-op game modes.

This is a 4-player same-screen competitive battler, attempting to bubble your opponents before they bubble you. Use a dash to cut through smaller bubbles but watch out for the large ones.