Kuranes_82: "Please, stop being this desperate and try having just a little patience."?
I finished the stamp collection almost 24 hours ago and haven't received anything yet. How's that for patience?
They're giving you an amazing game FOR FREE. GOG isn't huge, like Steam is, and you paid absolutely nothing for one of the best games in GOG's catalogue, so, yeah, I would recommend having a little patience and wait for the code to arrive in your e-mail. They have to send thousands of e-mails all the while generating serial keys for all the winners -- lots of people tend to enter GOG's giveaways and their systems aren't automated like the ones you may be used to with Steam, so these things take time. People have waited more than 24 hours for their codes to be delivered in past giveaways, namely the original Fallout trilogy giveaway and the Dungeon Keeper giveaway, off the top of my head.
If you're so concerned you won't get your code, feel free to contact support, though I would think they have their hands full by now, with all the people submitting support tickets because they haven't received their codes in the e-mail yet, plus all the usual game-related support tickets they get all year-round. Lots of helpful GOG users on lots of these derivative threads have posted links for you to use and contact support regarding this issue, so feel free to click them and contact GOG tech support -- they're usually pretty good at their job and they tend to be very helpful, even though they may take a little while to write you back, right now.
Make sure to check your spam inbox folder, as there's the remote possibility your e-mail provider is sending their mails directly into that folder. All I know is that you'll get the game, so I wouldn't fret. My copy of The Dark Eye: Chains of Satinav arrived almost 48 hours *after* I got the message saying I would receive it, so, yeah... I'd wait a bit more than one day before starting throwing tantrums for a game I paid absolutely nothing for.