Top similar games like orbital defence unit:

Tartaron is top-down shooter with an old-school art style and a variety of levels to beat. Engage in close-range combat, or snipe your enemies from afar, it's up to you.

Hack & Schlitz is an epic random-generated Arcade-Roguelike game. Starting a run will spawn you in a 2d-Pixelstyle dungeon where you can decide what difficulty the next room has.

Shoot your way through an endless stream of enemies! GLORP is an action roguelike where you must upgrade your skills and weapons to become overpowered

A faced paced retro arcade shooter where you blast through waves of pixelated enemies. Power ups drop, chaos builds and just when the legendary, massive boss snake rises for an epic showdown, a secret trigger flips the script-keep firing to witness an unexpected, over-the-top finish.

Join the quest to overtake the void and become a hero! In this game, you will slay your enemies in a point and click fashion and overtake the void for good, or so you think... Join the quest in taking over the void to find out!

Defend Spacebase 19 from the asteroids swarming down on the station! Shoot down waves of stones and equip different powerful weapons. How many waves can you last? A simple nostalgic retro arcade turret defense shooter.

A 2D retro action rogue-like game inspired by the original Space Invaders arcade experience. Shoot down incoming alien waves and upgrade your turret. Discover and defeat bosses, and unlock permanent upgrades, turret classes, and challenging difficulty modifiers!

Square off against your friends in this life-or-death shoving simulator! 2 Player Local Competitive 1v1. Best played with gamepads.

You Are The Bodies last defense against a bunch of Deadly Viruses. Fight off many Viruses, and save the Body with a High score. Can you be the greatest Defense? 

'Shoot or Die' is a thrilling 2D shooting game where you take on the role of the last human survivor facing a robotic uprising. Arm yourself with powerful weapons, such as the Fireball and Shield, and utilize game-changing perks, to navigate dynamic battlefields and outwit cunning enemy droids.

Stopping Santa is a Jazzy top-down arena shooter where you play a mercenary fighting against Santa’s legions. Short play sessions, simple controls, instant action, and a global leaderboard for the Top 10. Inspired by classic arcade games.

Classic Western Shootout Duel - One-on-One. Polish your boots, clean your revolver, and hit the road. It's almost High Noon ... and losing is not an option.

Core Breach is a fast-paced, twin-stick arcade shooter in a pixel art style. Play as a Trojan worm virus, outmaneuvering and destroying antivirus enemies. Upgrade your worm with powerful attacks and skills as you fight to breach the CPU core and uncover its secrets

Fight through hordes of enemies in this action roguelite, find random weapons and discover secret card combos to create devastating builds and survive the chaos.

WitchTrial is a fast single-player twin-stick arena roguelite. Dodge murderous sawblade formations, fight escalating enemy waves, and turn the arena’s traps against your executioners. Survive each day, endure nightly interrogations, and build a deadly combination of upgrades.

Find powerful weapons, fight monsters and discover the secrets of the Zone. Each weapon is different.

An experience unlike any other! Forget the single screen and play in a chaos of simultaneous windows. You and the enemies move between these isolated environments, which you can drag around. Shoot, dodge, upgrade your ship and create the perfect build in this Roguelike Bullet Hell!

07 GORILLAS is an arena kung fu shooter Game where players control a squad that automatically eliminates nearby enemies. Choose different gorilla units and unlock gorillas resonance bonuses and create unique builds, Lead your gorillas and wreak havoc in the enemy tide.

A space station, infinite waves, and a screen full of vector geometry trying to kill you. Your turrets auto-fire. Your satellites orbit. This is bullet-hell-yeah. In-game and permanent upgrades. 17 upgrade types across 9 weapon classes. Play, upgrade, repeat.

HONORLESS! is a 2D fighting game 1vs1 where trashtalking plays a key role. Insult your friends in local versus with custom phrases and then slice them to pieces.

A 1v1 gameplay loop with wacky characters where during a 90 second match a player can throw out bizarre attacks to knock the opponents health bar to zero.

Shroom Man's Destination is a 2D arena shooter roguelike where you fight through rooms filled with randomly spawning enemies. Throughout various encounters, players will collect powerful items to help them escape the underground.

stranded in space with nothing but a gun, hostiles start showing up out of nowhere... what now? you can't escape, but you can boot and shoot

DEADCAVE is a fast-paced 2D pixel-art endless shooter where you slash enemies with your sword, deflect bullets, collect weapons, and survive against relentless waves in dark underground caves.

Arcade car combat game set in virtual world where you play as virus

The Squids are here - but your soldiers are ready. Grow your squad up to 4 members by rescuing survivors. Obtain the best weapons, support, and equipment you can by gathering Squid Samples. Become a force to be reckoned with, one the Squids will fear for generations to come.

Play as a little purple square who just wants to have coins and not get scammed.

Cell Wars is a classic arcade shooter where your goal is to consume all enemy cells by shooting and eating them. Inspired by NES graphics, gameplay from arcade 80s cabinets, and early 2000s skill tree systems. Unlock abilities and skills to survive waves of regular, elite and boss cells.

Saddle up for Ricochet Rodeo, a 2D-platform, pvp brawl to see who's the fastest shooter in the pixel-rendered west. Assemble a posse of up to 8 cowboys to dance in chaotic deathmatches where bullets bounce and 1 hit kills.

TETRAGUN is quadrant-based shooter where you're surrounded on all sides. You'll gain powerful upgrades as you progress, but so will your enemies.

One prisoner. One hit kills you. Fight through 30 sectors of a space prison ship in a top-down roguelike shooter where every bullet can end your run. Reflexes, precision and dash — or die trying.

W.A.S.P. is an intense rogue-lite with fast-paced, enemy-swarming chaos with the action-packed shooting of classic SHMUPs. Players take control of powerful airborne ships to fend off waves of increasingly difficult enemies while navigating levels from outer space to desert planets.

Swept Under is a frantic top-down pixel action-survival where you play the Trash Man. Clean every piece of cafeteria garbage before the timer hits zero, earn cash, and buy weapons or tools from vending machines, because sometimes the fastest cleanup is murder.

Breach In Space is a 2D shooting game with challenging combat and very hard platforming. Find a way back to home galaxy through 4 different planets.