"what has been done to make the system work in real life" implies that A) communism cannot work as intended by Marx, and B) any of those attempts have been more than shams by people using Marx's beliefs to mislead their people.
Are you really sure either of those things are true?
And, wait, no, don't answer that. This is getting political.
In fact, I am locking this thread. I don't know whether the author of Dungeon Defense is a communist - I certainly know China purports itself to be, and thus it isn't strange for citizens of the country to identify with their government. I also know one quote does not make you a communist. More than either of these things, I know with an abiding certainty that NUF is not the place for political discussion.