Games like Formicide on Steam
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Omegalodon
Omegalodon is a third-person multiplayer action game where players compete by attacking/defending the city. The Red Team is comprised of police and soldiers armed with an array of military vehicles and explosive weaponry. The Green Team is comprised of Omegalodon, a 100-foot shark monster, and the Enviros, equipped with a healing beam.
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.
Destination Sol
Pilot your ship in the seamless open world made of space, planets, and more. Find new ships and equipment, find allies and beat all the enemies in this open source space shooter!
FULFILLMENT
Exciting Adventure About the Joys of Working at an Amazin' Fulfillment Center! Short, social commentary game that is 100% free, no micro-transactions.
SlipSlop: World's Hardest Platformer Game
One button platformer nightmare
ONE PIECE Bounty Rush
Take the loot, pirates! Bounty Rush is a 4 vs 4 multiplayer team action game. Work with your team to capture the other teams' berries!
Goose Goose Duck
Goose Goose Duck is a game of social deduction for up to 16 players. Players are separated into different groups that are each assigned a different objective. Complete your team’s objective to win!
Zombie Kill of the Week - Reborn
Zombie Kill of the Week - Reborn is a challenging, fast paced, 2D survival shooter! Featuring a compelling single player survival mode and cooperative multiplayer for up-to four players, this is one zombie firefight you're not going to want to miss!
Double Action: Boogaloo
Double Action is a free stylish multiplayer game about diving, flipping, and sliding your way into action movie mayhem.
Rogue Reaper
Rogue Reaper is an action-adventure game, taking place at the end of the Dark Ages during the rise of the plague. Trying to relieve her father from his work of managing the massive influx of souls, the daughter of the Grim Reaper sets out on an adventure to find and destroy the cause of the plague.
The Pirate: Plague of the Dead
Command the most fearsome pirates in an exciting Caribbean adventure! Plague of the Dead is a new installment of The Pirate series, featuring an open world without loading screens, dynamic day and night cycle and weather system, it offers each gamer an unforgettable experience.
Century: Age of Ashes
Century: Age of Ashes is a free-to-play multiplayer dragon shooter. Master a growing roster of classes and dragons, compete in intense arena battles and rule the skies in fast-paced aerial combats.
Touhou Fantasia / 东方梦想曲
This is a fan-made Touhou shmup with one single stage, similar to the extra stage of official Touhou games. This game has an auto dodging system, which gives you a choice to ignore all the danmaku and only focus on the story.
Impulse of War
Stop! You haven't captured the train yet? Didn't build a base and haven't mastered the planet? I won't jump from a springboard to take the flag! I'll be waiting for you!
Einar
The player takes on the role of Einar, who is on a quest to kill the inhabitants of a Norse fishing village who are infected by a mysterious material. Use different weapons such as the bow, hammer and axe to clear the village of the monsters.
Indie Pogo
Indie Pogo is a platform brawler game for 2-4 players about bouncing, ricocheting, and pogoing your friends into oblivion! Gather your friends for 2-4 player local romps, or climb the online ladder in the bounciest of battles. Prepare yourself for a rompin' stompin' jumpin' good time!
Cube Racer
Cube Racer is a round based multiplayer racing game with cubes. Every round, all players race against each other to the finish line. Before every round, the players get to build one or more obstacles on the map. In the next round, all players have to pass all the obstacles, which have been built yet.
Pew Dew Redemption
Dive into the role of Pew and fulfill your destiny as the last independent content creator. Face and Destroy the company and all of its subjects to bring peace and freedom back to the internet.
Zombie Panic! Source
Dive into the zombie apocalypse with Zombie Panic! Source: a cooperative, survival-horror first-person-shooter. A fast-paced standalone modification.