Looks like you need to uninstall your existing copy [if you have the F2P version] to activate the key, but afterward the key works fine and the game is perma-set in your library.
Pretty nifty, thanks :)
Though that referral link the raffle has is a bit awkward :P
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https://gleam.io/2Hbv3/merchants-of-kaidan-free-steam-key
http://store.steampowered.com/app/294020/
https://gleam.io/PBqMu/relic-hunters-zero-free-steam-key
http://store.steampowered.com/app/382490/
"Game is FREE on Steam but the key gives you 8 trading cards drop."
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