PLEASE READ:

Steam says: "This is a restricted gift which can only be redeemed in certain countries."
But which countries? Nobody knows.
The game develoepr says: "To be honest I don't know actually. My guess is that it is restriced from a lower currency to a higher currency(Russia to Europa or so)"
What I can tell is that it's redeemable in euro-zone, for sure. And probably USA too.

------ Please note that I'll probably send the gift to your email. ------

That said... good luck!