It was free in february. Perhaps you had limited with no trading cards :)
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I forgot I had the game and tried the key. I just got an Already Purchased error so it may still be good.
But most people on here may already have it, since it was free on Steam a few weeks ago: https://www.steamgifts.com/discussion/Rv4xf/free-ultimate-zombie-defense-steam
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https://www.alienwarearena.com/ucf/show/2170877/boards/contest-and-giveaways-global/Giveaway/ultimate-zombie-defense-steam-game-key-giveaway
https://store.steampowered.com/app/1035510/Ultimate_Zombie_Defense/?l=latam
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