So... my first "purchase" is a bunch of giveaway and Humble Bundle titles, and i guess that doesn't count. Right after those, there's The Witcher 3, but even then it was the boxed edition so it's not really a "GOG purchase". Further on, it seems like i have not actually bought anything on the GOG store proper, so... i guess... we'll just say The Witcher 3? Come on, it seems fair to me!