Please check to make sure you don't already own this! It's been bundled once previously and for some reason doesn't show as owned in the list of DLC on the base game's store page (at least for me). The page for this specific chapter and the DLC list in the Steam client appear to be working correctly though.

I'll send this using the SG key distribution system so it should show up on your won giveaways page shortly after the giveaway ends.

Comment prompt: what was the first video game you can remember playing (arcade, console, or computer)?

I'm pretty sure mine was either Shamus or Jumpman for the IBM PCjr.