Sigils of Elohim

Although Sigils of Elohim was released as a free prelude to The Talos Principle, it is actually a very good tetramino puzzle game worth playing on its own, even if you never intend on using the unlocked rewards. And if you do, you get a couple extra messages and epitaphs to choose from when leaving your mark in The Talos Principle. What's not to like?

Sigils of Elohim is a game requiring logic / or multiple repeats in various combinations. Mechanics of the game is really simple and the goal of the game is quite obvious. The very first levels can be solved within seconds later levels are more challenging and so more interesting...

So I unlocked a code for the Thalos Principle (best game ever btw, truely must have!). but when i entered my code in the "REDEEM REWARDS" menu in the Thalos Principle it told me "The unlock code entered was already used by someone else. You need a new unlock code.". Now since I don't know how to contact the deve i poste this here.
Will change to positive once i have a working code. (i do have pictures of the code and the error).
Edit:
Nice and quick response, thanks! (sorry it took so long to change this review)

This free game SO reminds me of Puzzle Inlay, but with Tetris Blocks!

This is also the Prelude to the Talos Principle, so it should get me warmed up for the game. (Or you can download the Public Test from SteamDB)

You'll also get FREE GOODIES for Talos Principle here!