Please, have a look from your country that you can see the game on Steam or on your Humble Bundle website.

Unfortunately this is not enough to be sure of anything. A buyer from Latin America, for example, will be able to purchase a key that cannot be activated in Europe even though the game is visible in Europe, on Steam and Humble Bundle*

That said, for you who seems to be from Poland, everything should be fine for your winner.
According to this thread, a key of this game purchased in Poland can be activated anywhere in the world. :)

Ty! :)

Thanks! Good luck to everyone ^^

thanks for sharing

Thx, GL

Thank you very much! :)