For some reason I didn'nt receive my Spelunky code from GOG, I already own the game, was going to give it away
all the best
 This is strange, just looked at my order history, it says on the 8th June, I gifted system shock 2 to myself, I already own it. wasn't spelunky the first bonus game when you hit x amount of summer sale points..
SS2 was free from clicking a box the first 2 days of the sale. Spelunky was the first "spend so much, get a promo code title". Those titles you need to hit "Redeem" on that promo page and they send you an E-mail with the time limited promo code. (Think you can also see it on that page).