If you are into the old style 2d well 2.5d games then I've just been playing one on steam got released the other day....
http://www.youtube.com/watch?v=FPdleC0Y9tg
The Showdown Effect is a 2.5D multiplayer action game inspired by 80’s and 90’s action movies. Champions from throughout time fight to death for fun, for glory and for awesome.
The Showdown Effect recreates the outrageous combat found in classic action movies and then takes it one step further. Use weaponry pulled straight from the silver screen's unparalleled arsenal: shotguns, baseball bats, assault rifles, umbrellas, grenades, katanas, rocket launchers and more.
No explosion is too loud and no bullet dodge is impossible. Impale your friend with a broomstick and tell them to “Stick around” as you jetpack off to the next enemy.
Up to 8 player fast paced, cinematic, multiplayer action
In-game, out-of-the box streaming capability to Twitch.tv (MAC support coming soon)
6 clichéd characters , each with unique abilities
4 levels across two different environments
4 different free for all and team based game modes
Solo matchmaking using ELO rating system
Custom rules sets to create your own game modes – Pistols only!
Progressive rewards and unlocks for character and weapon customization
Experience the most over-the-top action sequences from your favorite movies across different environments
Numerous heroes, dozens of weapons, hundreds of moves - infinite fun