Pikwip
Head to the summit. Local co-op or single player.
Streets of Rogue
A Roguelike/RPG/Stealth/Shooter/Brawler
EGGNOGG+
Local multiplayer stabbing game for PC, Mac, Linux
Gladihoppers
2D physics-based gladiator fighting game!
Guardian Sphere
Shoot 'em up in which you use your life point to buy upgrades
Wild Woods
Go on an expedition, cooperate with up to four friends and fight your way through the woods
Pencil Peril
Paper Puzzle Platformer
Normal Human Face Simulator
Local 2-player face-biting simulation
Shattered Realms
A Combo Heavy Co-op Brawler
Regular Human Basketball
No giant mechanical death machines here!
Giraffes Volleyball Championship 2016
simple volleyball multiplayer minigame
Super Tilt Bro. for NES
Smash bros-like NES homebrew
Super Mario 127
The sequel to Super Mario 63
TowerFall Ascension
Local Multiplayer Archery Chaos!
Among Us Arena Ultimate
An Among Us Fighting Game Fangame
Sagittarius
Competitive cosmic archery!
Paddle Force
Two player fast-paced pong-like with powerups set in space.
Neon Knives
Blend into the crowd, hunt down your opponent, and take them out. Couch multiplayer.
Command Ant Conquer
[Unity] Ludum Dare 38 (2017-04)
Snow World
A two-button RPG made for Ludum Dare 34
Toasterball (Prototype)
A mutliplayer sport game with toasters.
Birdsketball
Local multiplayer basketball with birds
Tachyons
It's like FTL but multiplayer :)