I approve of this idea however this belongs on
>>>/games/ comrade. They actually have some good threads about games with communist ideas that you can find ideas for.
The basic rule however is that you have to avoid using the words communism or direct socialist symbolism (hammer and sickle on a red flag) because most people shy away from that like a horse from fire. Something clver I've seen is using small uncited quotes of various socialist leaders and theorists and having characters state them in appropriate situations as a subtle commie-pill as well.