Top similar games like Mutation Mayhem:

Rustbuckle Rumble is a side-scrolling, team-based, arena combat game - WITH ROBOTS! Inspiration for the mechanics was taken from classic run and gun games mixed with more modern, class-based, multiplayer shooters. It’s capture-the-flag where the players are the flags.

Time Clickers is what's called an 'incremental game'. There's always a fun upgrade to look forward to, and the numbers keep getting bigger! Hire a team to fight for you, even when you're offline!

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.

Rollout is a multiplayer "eat-to-grow" game set in a three(technically four)-dimensional world.

Ever wanted to create your own Multiplayer FPS? Now you can!"But.. it's hard." No, it isn't, you just need motivation and some basic programming knowledge.This game is the Free-to-play Demo of what you can create by watching the Video Series "How to Create a Multiplayer FPS in Unity" available on Steam Video Platform!

Chaotic bacon-flavored beat'em up with plenty of enemies to smash around

Drive on down to the CARRUMBLE arena and test your skills against fearsome opponents in a lawless clash where no quarter is given or taken. Climb the ranks and aim to become the CARRUMBLE champion!

Free to play, air hockey style arena humorously referring to internet culture. Attack your opponent’s computer by decreasing its FPS capability. Defend your own virtual PC. Climb the ranks online and compete in league seasons!

Swing Dunk is a Sci-Fi Sports game based on basketball. The game has up to four players assigned to each of the two teams, using Hoverboards to shoot the ball into their opponent's basket. The game includes single-player and multiplayer modes which can be played both locally and online.

Cute and chaotic fun! Play as one of 7 different character classes in a quick and deadly multiplayer PvP arena shooter where only the quick witted survive. Compete against your friends in classic team deathmatch or overcharge yourself and pummel the enemy base in our Orbomb game mode!

GROTORO is a multiplayer couch space globular fatty nervous farting bull brawl in space.

Super Versus! The ultimate multiplayer action superhero game! Compete in online super powered battles with and against your friends!

Fast, party platform game for up to 4 players. Finish levels as quick as possible. Collect nuts using movable objects.

Lead your favorite Champion to victory! In this fast-paced Real-Time Strategy, become a GOD, cast miracles and command epic battles in a MINIature world. Fight 1 on 1 with players around the world! Who will crush the other first? The fate of your MINIs is in your GOD hands.

DAMNOSAUR is a chaotic arcade shooter that combines colourful anime with the Dino-apocalypse! Fight alone, or with a friend to take down these monstrous dinosaurs.

Oh Trap! is a couch co-op game for 2 or 4 players. Steal the other team’s treasures! Place traps strategically to either help yourself or stop your opponents.

SUPER RECOILFIGHT is a one-button projectile brawler-shooter that recalls the fun of a coin-op arcade for up to 4 players on a single keyboard. Time your shots right to win against your friends, AI or both.

No matter what happens outside, keep exercising at home using only a computer and a smartphone. Your workouts won’t be boring ever again with entertaining and interactive gameplay. Have fun and be healthy with Fitforce.

Can you clear the islands from the zombies that are lurking on them? Can you find out what caused this to happen... Can you find the easter eggs? Why not try it out...

Drop In - VR F2P is a Free to play Low poly social game space. In Early Access players will be able to hang out in a lobby, play mini games, Squad up for Apoc, Zombies or Sandbox. Missions are being actively developed. DLC will be added after the game comes out of early access.

Face off against your friends with wacky guns that don't shoot straight! Misfire is a Casual PVP Platform Shooter created by one person. Compete in matches of 2-4 players, earn coins to unlock stylish new space suits, and ruin some friendships along the way!

League of Pixels is a fast paced pixel art approach on the MOBA genre, with an average game length of 5-10 minutes.

Calamari Clash is a multiplayer versus game which takes you into the role of a Calamartian who crashed on an unknown planet along with its companions. Dash it out against each other to charge the spaceship’s battery and escape. Only one can escape… who will it be?

Chaos is an online FPS game. Why should you play it? Destruction, lots of it, plus some explosions, oh yeah, guns! Who doesn't like guns and explosions?

Kill as many cars as you can in this action-packed free student game!

Bathe your Frog King by jumping, hopping and tonguing yourself around maps in Frog Bath with the goal of beating your friends at giving His Cleanliness a bath! Spit and steal bath items from your friends to give the best bath possible to the Frog King.

Enter the simulation with friends to locate Meow & get to the bottom of the Blue Pill Glitch!

Jelly Brawl: Classic is a FREE sticky and destructive multiplayer party game where you gotta jiggle, flop, and pop your way to the top! Fight alone or against friends for freedom from a mad king across tons of stages, mini games, and modes as you wrestle to be the last jelly standing!

Play as a Turtle and duke it out in a game of Football. Use your gun to fly around the field or even shoot the ball.

Cart To The End is a First-Person Multiplayer Game where you need to avoid different kinds of obstacles and other players to make it to the end. Shouldn't be that hard. Right?

Panzer Arena: Coop is the coop version of Panzer Arena. In this version you can team up with a friend and fight hordes of AI enemies in multiple maps and game modes.