- Enter your e-mail address in the box at the top of the store page (no need to sign up to the newsletter).
- They will e-mail you with a link to redeem the key.
- You will need to join the IndieGala Steam group (in Steam) and allow Indie Gala to activate games in your Steam account (same as Humble does these days).
- Once you have the game in your Steam account you can leave the Indie Gala Steam group, if you like (and I do).
The game has trading cards (3 card drops & 5 in the set), so you can sell the 3 cards for a few pence. :)