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This game was offered as one of the first Twitch Prime benefits.
From the steam store page:
Originally posted by another user
Welcome to Streamline, a fast-paced, third person game built for and around streaming. Take on the role of Broadcaster, Player, or Viewer and change the way the game itself is played!
The game stops being free at 9AM US PST on November 18th. If nothing else, click install (no need to actually install it) to add a game to your library collection.
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The store page says that purchasers of the game exclusive Streamline outfits for Portal's Test Subjects and Team Fortress 2's Scout, but there is no confirmation that these are given while this promotion is going on.