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.

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.

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.

Blast through waves of alien enemies in Project AionIX! Master your piloting skills, dodge, and survive in this fast-paced space shooter!

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.

Pilot your space vessel in this action-packed space shooter. Defend your station using various weapons, power-ups, and turrets. Balance fast-paced dogfighting with smart fortification as you face waves of enemies in this arcade blend of quick combat and thoughtful planning.

Minestorm reimagined with modern gameplay! Blast through waves of deadly mines, gear up with powerful upgrades between levels, and dive into intense rhythm-based stages set to an original soundtrack !

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!

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.

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.

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!

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.

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!

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.

Royal Odyssey is a fast-paced, top-down space shooter inspired by classic Shmups. Pilot Prince Zayven’s ship through a deadly asteroid field, upgrade your ship, and navigate the dangers of space to complete his heroic mission.

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. *

The colorful top-down shooter/bullet-hell

Retro style 2D vertical scrolling simple shooter.

Synth-wave styled physics based 2D puzzle shooter filled with nods to the golden era of classic arcade games. Think upside down Peggle crossed with Space Invaders and enemies crafted from the blended remains 70's, and 80’s gaming.

Combining retro puzzles and a arcade space shooter. You and your crew found strange materials in the galaxy core to upgrade your ship to the most powerful. While collecting core materials you came across something unbelievable ... The Core Message. The Core Message changes everything.

Crush the forces of hell and get a high score in this addictive, action-packed, arcade-inspired twin-stick shooter!

This is a retro space shooting game, where you only fight against the strongest enemy. There are 15 unique bosses in the game, and players need to use different weapons and strategies to defeat them. Dedicated to you who are both challengers and retro game lovers.

Top-down shooter action for the Atari Lynx handheld console. WANTED: Hot gun for hire. Travel to several exotic and dangerous places. Discover several exotic and dangerous aliens and kill them. Kill lots. For cash. Buy more weapons and kill again.

Chaotic boss-rush, bullet-hell-y, twin-stick arena shooter mayhem! Dynamically changing arena forces you to be vigilant: Watch the bullets, watch the walls!