Deathmatch
Deathmatch or Player vs All (PvA, also called DM or free-for-all) is a widely used gameplay mode integrated into many shooter and real-time strategy (RTS) video games. Normally the goal of a deathmatch game is to kill (or "frag", from the military term) as many other players as possible until a certain condition or limit is reached, commonly being a frag limit or time limit. Once one of these conditions is met, the match is over and the winner is the player that accumulated the greatest number of frags. It is an evolution of the competitive multiplayer modes found in genres such as fighting games and racing video games Read the full article at the Wikipedia.

Code Clash
1.0 (23 Jan 2018)Code Clash is a fast-paced strategy game, where two teams construct units and try to outwit each others tactics - without controlling...
Genre: Arcade, Construction and management, Strategy 
Bionic Attack
1.0 (19 May 2017)Bionic Attack is a fast paced Real Time Strategy game set in a post apocalyptic world, where two factions are fighting for the planet domination.
Genre: Strategy 
In Exilium
1.64 (2 Oct 2015)In Exilium is a 3D, "isometric" hack and slash RPG with an emphasis on minimalistic design and player discovery.
Genre: Role-playing, Action 
DDay Normandy
Here is an game who work on linux since very very much time, but it was not instructions to compil the game on this os, it was very difficult.
Genre: Shooter, Action 
Arcmage
rolling releaseArcmage is a fantasy-themed card game.
Genre: Card game, Turn-based, Strategy 
EGGNOGG+
by Madgarden
beta
EGGNOGG+, a competitive arcade game of immortals sword-fighting to the death.
Genre: Arcade, Platform 
Clash of Aggression
by Mencapento
0.6.0
(23 Apr 2018)
Clash of Aggression is all about "last stand": your team against dozens of enemies.
Genre: Shooter, Action 
Pandum
1.11.18 (25 Jan 2018)free to play cross-platform MMORPG with arcadified gameplay
Genre: Arcade, Beat 'Em Up, MMO, Social, Role-playing 
Strife: Veteran Edition
Hailed as the original FPS-RPG game that spawned countless imitators, Strife: Veteran Edition is a love letter with new features to...
Genre: Shooter, Action