Social game with clever tower defense mechanics that simulate Third World sweatshop employees trying to manufacture shoes, bags, and shirts under your direction. Admirably keeps the overt social commentary *between* rounds, and lets the Kafkaesque nature of the labor quotas and worker suffering speak for itself, while giving the player the chance to *act* on the suffering they see and work for improvement. I'm thinking this might be one more to add to your (correctly) short list of decent "message games."
I also might be asking for selfish reasons, because if you review this thing maybe you can drop a bit of advice on how to beat the last freakin' level. >_<