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!
Probably worst/weakest in this genre, poor vs other titles - maybe graphics is the greatest weapon in gaming. This is the case.
OpenLieroX having more fun, OpenClonk having more play points: in contrast, teeworlds own best reputation and fame, increidle.
Just imagine Quake3 in 2D and cartoon graphics and you have TeeWorlds ( formerly TeeWars ). Nice action-packed game with various game modes ( Free for all, Capture Flag, Instagib ), deadly weapons and grapling hook.
There is no single player in the game, you have to connect to online servers to play. Servers are very reliable, usually full of players. You can play at same server with players running TeeWorlds on Windows.
Game is moddable.
As I'm a child of the older generation (NES, SNES, Genesis, C64, Amiga, etc.) I really liked the concept and the graphical output. Also, the gameplay was fastpaced and fun, including pretty good implementation of controls, and there is a certain "something" when playing this kind of game against fellow human beings.
Would've liked to see it on different platforms, though (GP2X-F200 or NDS homebrew).