Top similar games like Intrusion Protocol:

Vlambeer's SUPER CRATE BOX is coming to bring back the glory of the golden arcade age, when all that really mattered was getting on that high score list. Grab your baseball cap and loosen your pants, it's time to fight endless hordes of enemies and collect every weapon crate you can.

Pentasma is a side-scrolling arcade shooter inspired by Williams Electronics' 1981 classic 'Defender'. Protect The terraforming Humanoids from the deadly Aliens and raid the Alien planets to keep the galaxy peaceful!

Offendron Warrior is a retro arcade that combines shooting and defense. Your objective is saving Offendron civilians in the planets from the group of enemies, who are trying to spread a virus that turns Offendrons into mindless killing machines and eventually destroy the whole planet.

SUPER FLAIL is a fast-paced arcade score attack game of flail-swinging rampage. Swing your flail to destroy everything until you die. Compare your score with other players and get on the top of the leaderboards.

Frantic Dimension is a retro twin-stick shooter inspired by the earliest twin-sticks, 'Space Dungeon' and 'Robotron 2084'. Never stop moving and shooting... or you'll die.

DED - a game in the shoot'em up genre. Your granddaughter has been kidnapped, and your daughter and son-in-law murdered. Having just bits and pieces of information about the abductors, you will have to save your granddaughter and find the masterminds behind these crimes.

Take the lost soul to its home.

Rolling Bird is a retro arcade shooter, heavily inspired by Namco's 1986 classic 'Rolling Thunder'.

CHRONAC! The roguelike action game where you shoot, slash, blast your way out the facility that created you. Gain powerful upgrades, face unforgiving enemies. Together.

Surreal, abstract and dark puzzle featuring simple yet challenging mechanics. The retro maze awaits!

Penarium is a frantic 2D arena arcade game where you take on the role of Willy, trapped in a sinister circus show. Run, jump and avoid an array of killer death-traps while being cheered on by a sadistic crowd that’s out for blood.

Go on a journey in Magic Frame - classics inspired Action-platformer. Explore levels and caves, fight bosses, upgrade equipment and enjoy the ambient.

Fight your way across the celestial world of Avalice where cats are green, motorcycles drive up walls and monster girls do most of the buttkicking! Freedom Planet is a cartoony, combat-based platform adventure that pits a spunky dragonoid and her friends against an alien attack force.

GUNKID 99 is a fast and frantic 2D arena-shooter that will seriously challenge your skills and reflexes. Craft your own unique play-style and develop crazy combos​ with numerous weapons and abilities at your disposal! Lay waste to endless hordes of enemies and get that top score on the Global Leaderboards!

Wryn is a girl with a big arsenal and big dreams -- she wants to be the ultimate videogame hero! Help her take down the Greatest Heroes of All Time in an action-packed bid to claim the title for herself and show the world what a true hero looks like!

Super Blasting Boy is a logical platform platformer made in the best traditions of retro games of the late 80's and 90's.

EXTREME! retro side-scrolling shoot 'em up with a colorful twist! Become one with your controller, learn all rocket colors by heart and master a unique color-based destruction! SHOOT DIE RESPAWN! And most importantly... NEVER GIVE UP!

Give Me Your Coins is a fast-paced platformer built on precision and momentum. Try to get out of the magic chest, go through the several dozen levels created inside his wooden body.

You Have to Win the Game is a free exploration platformer with a retro 1980s PC aesthetic.

HAVE FUN DYING! Sockventure is a challenging 2D platformer game where you play as as superhero Supersock. Get new skills, find your way through the cursed washing machine full of spikes, flames, lasers and acid, and bring the missing socks back safely. Free Demo for the game Sockventure.

Battle Princess Madelyn is a game that follows the journey of a young knight in training, Madelyn, and her ghostly pet dog, Fritzy. Join them as they set out on a journey to save her kingdom and her family from the clutches of an evil wizard!

Swing, dash, slide and slice your way through this retro style 2D side scrolling platformer! Blast, hack and slash your opponents or bounce off their heads! Power up Fantastic Fania to finally confront the Phantom of Zana!

DYE is a challenging precision platformer where you help Hue rescue Pigments and defeat the nefarious Necrolights in order to restore color to the world! Jump, wall jump and float your way through 4 unique worlds with hundreds of challenges ranging from beginner to advanced level.

Play as Chelshia the chimera in this platforming beat-em-up adventure into the wonderful world of monster girls!

Red Horizon is an addictive space shmup game. Heavily influenced by the classics of the past, Red Horizon takes a modern spin on the genre combining it with some subtle Rogue-like elements to provide players with a unique experience every time they play.

Welcome to the world of Ctrl CV, a find-the-image platformer puzzle game. You are surrounded by countless clones of yourself, and your goal is to find the source of these doppelgangers. Try not to lose yourself in the midst of "yourselves".

The infamous, tough-as-nails platformer comes to Steam with a playable Head Crab character (Steam-exclusive)!

Robot wants stuff! Go get it for him in this compilation of the metroidvania Robot Wants series, including an all-new Robot adventure!

Giulia bought a game to surprise her boyfriend. While she was waiting, she was sucked into the game. Now our hero has a mission to rescue her before the game destroy itself.