Targeted deal, check your email if you have a GOG account, you may have received a unique one-time code which can be applied by following the instructions in the email. Pretty sure this is a historical low, either way at $4 I'm not complaining.

From the website:

Firewatch is a single-player first-person mystery set in the Wyoming wilderness.

The year is 1989. You are a man named Henry who has retreated from his messy life to work as a fire lookout in the Wyoming wilderness. Perched high atop a mountain, it’s your job to look for smoke and keep the wilderness safe. An especially hot, dry summer has everyone on edge. Your supervisor Delilah is available to you at all times over a small, handheld radio—your only contact with the world you've left behind. But when something strange draws you out of your lookout tower and into the forest, you’ll explore a wild and unknown environment, facing questions and making choices that can build or destroy the only meaningful relationship you have.