hello, this should be a valid key. i just opened this key on humble bundle.
as far as i know the key is redeemable on NA Steam.

if it's not valid and cannot be redeemed, drop a comment, and i will see what i can do.
please double check to see if this game can be redeemed in your country before you enter.
in the case that a key cannot be redeemed, i may request a deletion.

gl in the giveaway!