Gang Garrison 2 is an 8-bit game by Faucet (something like a valve). It has multiplayer capabilities just like Team Fortress 2 from which it is based on. The objective of the game is to capture the enemy intelligence and return it to the base, just exactly like in Team Fortress 2.

The game begins with a loading screen as you can see is a parody of the original.

The 8 classes(there is a secret class to be used when you press Q in this menu)

You can even shout out for spy and healing
Some gameplay video.
Gang Garrison 2 is nearly as fun as its 3D counterpart and I predict it to be fairly popular in computer labs of some schools
You can get the game here