Is the card drop of Galactic Arms Race disable?

I got that badge leveled up to 5 here.

There are several people reporting your problem:

cause no card-drop in this game
http://steamcommunity.com/app/249610/discussions/0/405692758700063727/

last message from dev June 14

A guy just messaged me and confirmed he had gotten some. Lemme know if you still have problems. It may be your Steam settings or something like that.

Odd, I have this as well and it won't idle and it tells me I have no drops remaining even though I never got any for this game. Went ahead and just bought the cards for the badge since I can't be bothered to worry about the drops.

buy game
try to idle cards
spend 2+ hrs
no cards drop
cant refund game
profit

perhaps it dont drop cards while you idling it, only logged in time to servers count. I had no issue to get the cards while i played it long time ago.