I don't buy a lot of games and also didn't have a hunmblebundle account. I had to find where to redeem codes in steam and that cost me a some time. For you it might be routine :P
Remains to be seen if glass coffins become popular.
Yeah that's my bad then, shouldn't have assumed everyone was as familiar with the interface as me. Since there's still (almost) 4 hours left on the promotion, gonna leave this link here for anyone who still wants to redeem the key but might not know how.