The game is free on Fanatical, although for a limited time, if you’re willing to jump through a few hoops. To claim it, you need to (1) create an account; (2) connect your Steam;* (3) verify your email address; and (4) sign up for their newsletter.

Good luck, and have fun!

P.S. The key expires on December 14, 2023 at 11:59 PM (UTC), so make sure to activate it as soon as possible. Also, after you’ve won, please leave feedback that you’ve received the key.

‎* Your Steam account must not be limited in that you have to have spent at least five US dollars within the Steam store.

Update
Congratulations to Stepka!