Top similar games like Operation Zero:

Rogue Sentry is a difficult twin-stick adventure shoot-em-up about a sentry droid who turns rogue to save humanity.

A top down, twin stick shooter inspired by classic retro arcade games with loads of enemies, fast paced bullet hell combat, big boss battles and tons of bullets.

Lead your starfighter as a bounty hunter, complete contracts and fight your way to free your home system from a criminal empire full of conspiracies and underworld secrets, in this hard boiled action old school arcade shooter.

A 2D vertical shoot 'em up that lets you upgrade your ship with an insane amount of options. From missiles and pods to specials and shields, you can upgrade every bit of your ship from guns to thrusters.

Grab the fate of all life in your hands. Blast your way through the cosmos, destroying monstrous cosmic beasts and the space cultists summoning them, on your path to stopping your mother from unleashing the chaos realm upon the universe, in this sci-fi cosmic horror bullet-hell, STARR RINGER.

You've been dropped into enemy space. Weave your Starfighter between alien spaceships, lasers, asteroids and bombs destroying as many as you can and collecting valuable coins and powerups as you go.

Alpha Force Zero is an intense top-down bullet-hell adventure that requires skill and planning. Utilize multiple weapon systems including an Auto-Turret with adjustable firing modes and unlock upgrades that you can equip in your ship to give you the upper hand. Dodge, fight, survive!

A sci-fi shoot'em'up game with heavy focus on upgrades experimentation, featuring two unlikely heroes that must work perfectly together, despite their share of secrets, to surpass their limits and succeed in eliminating a threat that might destroy both Earth and Andraxia if left unchecked.

Neon Fighter is a tiny arcade game packed with lasers and explosions, in which every few seconds you are forced to switch weapons automatically, making you have to adapt quickly to the new situation and re-evaluate your perspective.

Zone of Lacryma is a story driven vertical shmup with 11 levels, highscores, speedrunning, upgrades and more.

Talented and ferocious weapon experts needed to eliminate a dangerous mechanical menace that threatens the existence of humanity. Up to six positions available. Benefits include traveling the world to eliminate robots.

Rendagor is a 2D Top-down Shooter starring a service bot. Just a simple machine... or something more? Uncover dark secrets in Story Mode or master the challenge of Arcade Mode. Shoot, smash, and demolish enemies and destructible environments with a devastating arsenal.

In the Valley of Death is a color-based hack and slash twin-stick shooter, where the player controls Red and Blue as they dash, slash, and shoot their way through challenging levels as they attempt to make it to the Valley of Death.

Inspired by the cult classic Mine Storm, Storm Mined modernizes arcade space shooting with rogue-lite upgrades and rhythm-based stages.

In the vast depths of space, lies a man with a dark past. Setting himself apart from that old life, and seeking justice against wrongdoing instead of being the cause of it, Captain Righteous uses the Freedom Fighter, his trusty space fighter to search for and combat the evil Captain Buster!

Void Prison is a fast paced, endless arcade twin stick shooter that puts you inside of an ever shrinking ring. Survive by fighting emerging enemies around you and don't get consumed by the void. Complete achievements to unlock new skins and powerups and get on top of the leaderboards!

GUN KING is a fast-paced top-down arcade shooter with unique gun mods that lets you play your way. Unlock and equip powerful gun mods to create wild synergies, amp up your firepower, and blast through hordes of enemies.

EXOVORE is a fast-paced twin-stick space horror shoot’em-up inspired by the arcade classic Sinistar. Harvest asteroids, build your arsenal and face an evolving alien terror that hungers for your ship’s core. Retro-style visuals meet modern chaos in this relentless fight for survival among the stars.

Start off as a weak ship with a simple attack and fight through waves of enemies, earning currency in order to purchase upgrades for your ship. The never ending waves of enemies grow in number, power, and variety as you progress. Purchase upgrades to keep pace with them.

Blast through five worlds, claim the Cosmic Gems, defeat Lord Zorkannan, and master every run in this fast arcade shooter.

A vertical arcade shoot'em up with an inventive teleport system, lots of fast-blazing action and explosions, tons of boss fights, a risk/reward based score system and a proper challenge for both veteran and new players of the genre.

Steel Alcimus is a top-down helicopter shooter. Complete various tasks with your ally aircraft; such as saving the carrier, taking down the buildings, carrying objects, etc.

Timeloop Titans is a fast-paced space arcade shooter where you defend the breathtaking Planet Gaia from relentless alien invasions. Upgrade your ship, conquer challenges, and save humanity in this cosmic battle for survival!

Do you ever want to just relax and slaughter something? Well, lucky for you, the pigs have gone mad! They are destroying everything! So grab your trusty double-barreled friend and put an end to this Bacon Rebellion!

ZEROCRON is a straightforward, classical arcade Twin-Stick Shoot-Em-Up with a strong Commodore-Amiga-era feel. Blast asteroids and enemies to burning pixeldust!

Tank vs Orcs is an action packed twin stick shooter in development where you get to live out the ultimate power fantasy; being a fricken' tank and battling endless hordes or orcs.

A mouse-only, endless sci-fi arcade shooter with dead-simple controls — just aim and auto-fire kicks in. Shatter asteroids into plasma cores, wield three upgradeable weapons, freeze time, and survive endless difficulty scaling.

As Robo, you will decide the destiny of Gear Town and its robot people. Make decisive choices, explore biomes, solve puzzles and mini-games, battle hordes of robotic enemies in this cute pixel-art Twin Stick Shooter RPG, and write the Robo legend.

Join Captain Rijk as he attempts to escape from the clutches of one of the most villainous species in the galaxy. Help to uncover the horrors that are being carried out on the fringes of the civilised galaxy and become the divine being prophesised to inspire an uprising and destroy The Domain.

Twinstick shooter! Aim for the highest score before you are finally overwhelemed!

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. *

Royal Odyssey is a retro-style arcade space shooter where you pilot Prince Zayven’s ship through a deadly asteroid storm, blasting your way to survival.

The colorful top-down shooter/bullet-hell

Retro style 2D vertical scrolling simple shooter.