Games like SYNTHETIK: Arena on Steam
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Alien Swarm
Co-operative multiplayer game and complete code base available for free.
SAS: Zombie Assault 4
Purge the undead! Intense action-shooter with deep rpg elements, including upgradeable guns and armor, unique class skills, and class special abilities. Entire game can be played single player or as a 4-player online co-op game, including PvP events like Last Man Standing.
Veterans Online - Open Beta
Veterans Online is a thrilling top-down twin-stick shooter suited for both casual and hardcore players, featuring fun warfare with easy to learn but hard to master mechanics.
Formicide
Formicide is a fast-paced 2D online platformer with a lineup of versatile classes. Think Worms meets Team Fortress 2. Face off with teammates against enemies in destructible environments with the weapons and abilities at your disposal.
Snake Force
Snake Force is an alternative top-down shooting game inspired by the classic game Snake. In this game, you’ll rescue your bros and fight along side with them. You and your bros will stand in a line, and shoot at the same point. Keep the shape of your squad, because bullets hurt whatever they hit.
pla_toon
pla_toon is an action-packed, first-and-third-person, multiplayer, light-hearted, cartoon-style shooter where you as play a soldier. Join the multiplayer battle and be the first to a para-crate drop to equip your player with powerful weapons! Or get on an ostrich and ride off into the sunset...
Of Guards And Thieves
Of Guards and Thieves is a multiplayer stealth game in which high-powered guards face off against fast and elusive thieves in a contest of wits. Outsmarting the enemy and shooting your way through to the goal are equally valid strategies. Simple rules, emergent gameplay and high replayability.
From Space
From Space is a solo and co-op action-shooter for squads up to four players. Take on the challenge of liberating the earth from an alien infestation with your friends, using over-the-top weaponry in a post-apocalyptic world with awesomely stylized graphics. The apocalypse has never been so much fun!
Light Bearers
Light Bearers is a multiplayer asymmetrical hide and seek game that pits a sinister shadow against cute light bears!
Forkdrift
Have YOU ever wanted to flip your friends? How about driving a forklift? Or maybe picking up boxes too heavy for the mortal man? Well now you can, in Forkdrift! Forkdrift is a online PVP game centered around action-packed, competitive forkdrifting!
Livelock
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.
Teeworlds
Teeworlds is a free online multiplayer game, available for all major operating systems. Battle with up to 16 players in a variety of game modes, including Team Deathmatch and Capture The Flag. You can even design your own maps!
Apotheon Arena
Apotheon Arena is the free online-multiplayer complement to the mythic Greek action RPG, Apotheon. Pit your skills with spear and shield against other players in brutal bronze-age combat. Battle across the statuesque arenas of Olympus, depicted with beautiful black-figure pottery artwork.
SYNTHETIK: Legion Rising
SYNTHETIK is an unforgiving tactical shooter rogue-lite where freedom and experimentation is key. Fight in a world overrun by the Machine Legion and their Gods. Experience the next level in gun-play and dive into unparalleled build options and Android upgrades. Can you defeat the Heart of Armageddon?
The Red Stare
Become a secret agent in the 1950s and observe your neighbours to find the communist spy!
Rebel Forces
Are you ready to be the ultimate soldier and fight until you defeat all of your enemies?
Red Eclipse
Building on over 15 years of gameplay design, Red Eclipse continues to focus on fast paced, agile, easily accessible first person shooter gameplay. For creators, the full power of the Tesseract engine is at your fingertips in the included realtime multiplayer editor.
The Ultimatest Battle
The Ultimatest Battle is a real-time, 2D platform game in which two teams compete in different game modes with an almost completely destructible environment. UB is a true Free-to-Play, absolutely no Pay-to-Win.
Grimoire: Manastorm
A free multiplayer wizard FPS which features six classes to master with thousands of possible spell loadouts. Choose your class of magic, customize your spell book with dozens of abilities, and battle against others for supremacy in FFA or Conquest, or go solo to survive against waves of the undead.
Hazard Ops
Ready for the next generation of 3rd person shooters? Hazard Ops has zombies, monsters, robots, dinosaurs, mechs - pretty much anything you can point a gun at. Sink your teeth into this action-packed online shooter!
Guns and Robots
Guns and Robots is free to play online third person shooter. The game brings robot action with massive customization. Players get cartoony bright 3D graphics in attractive environments and challenge each other in open arenas.
Project Zero Deaths
Project Zero Deaths is a hectic physics-based F2P online multiplayer platform shooter. Jump into frantic battles in dynamic maps, solo or with friends, to fight in varied wild game modes! Choose between different characters with unique skills and customize them and their weapons to your own playstyle!
PICO PARK:Classic Edition
PICO PARK:Classic Edition is a cooperative local/online multiplay action puzzle game for 2-10 players.
Skillshot City
Loot, shoot, cast and drive in this chaotic PvP Roguelite. Level up fast, draft wild skills, and create crazy combos on the fly. Explore a GTA-style battle royale with no queues or downtime as you prepare to win the final fight!
Cartoon Strike
"Different realities, different rules, but always fun". In the multiplayer game Cartoon Strike, each map offers a different gaming experience. Players can enjoy a few minutes of fighting in the WWII, followed by a few minutes in the present, future or even funny mode.
Killsquad
Hack and slash? Check. Twin-stick-shooter? Check. 4 player coop to slay hordes of aliens & bosses with your friends? Check. Skills, upgrades, weapons, gears, talismans and more to make you stronger? Check. Wake up, bounty hunter. We have a mission for you. Time to clean up the scum of the galaxy.
Climb
You thought you were the only rock climbing hipster around, but these mountains are full of them. Eliminate all competition and claim your rock! Climb, an online multiplayer brawler with short and action packet game sessions!