I've double checked that I entered it exactly. The key seems like it is still active from here in the USA. I don't know why it did not work for you. I do not think it has region limits, but if it does and I failed to notice and flag it as such, I apologize.

I'm afraid since the game was removed from the Steam Store on January 5, I cannot obtain a replacement key.

To make it up to you, I've sent you The Howler as a replacement. Hope you enjoy it.