Got a reply to my Metro 2033 support ticket. Looks like we won't be getting keys until at least Monday. Oh well, I got the game for free anyways from trading in Commandos 3 and DEFCON. Still have another $10 credit from free games gotten over the past couple of years.
Hi,
We are very sorry to hear that you have not received your key for Metro 2033. This game has proved so popular that we have temporarily run out of keys.
Unfortunately, because it is the weekend, we will not be able to send you your key early next week. Rest assured that you will receive your key.
We understand your urgency to play your new game and we are sorry for any inconvenience.
Kind regards,
Green Man Gaming
Customer Service