Molleindustria is also worth a look, although they're coming from a slightly different direction. The gospel in eight bits and ten seconds:

http://www.molleindustria.org/runjesusrun/run_jesus_run.html

And "Kosmosis: a communist space shooter is an arcade game from an alternate present where non-degenerated socialist values are hegemonic", and which is more fun than that sounds:

http://www.molleindustria.org/kosmosis/kosmosis.html