Mich wundert gerade, das noch niemand dieses 2D TF2-Game genannt hat.
Gang Garrison 2
Gang Garrison 2 is a free multiplayer 'demake' of Valve's Team Fortress 2 started by mrfredman and MedO with many developers later adding new features. With all 9 classes, many different TF2-inspired environments, and fast-paced, team-based, multiplayer gameplay represented, GG2 is the premier TF2 tribute/parody/alternative.
Es wird sogar noch von Leuten gespielt.