Firewatch has free roam now for free!
Mostly you walk around and so not very much work, while having conversations with your supervisor Delilah. It doesn't sound like much but there's a whole lot going on when you dig into the meat of the game.
First released back in February 2016, the game now has a new addition which makes it even more worthy of your time. Developers Campo Santo have added a Free Roam mode which lets you wander around the gorgeous stylised world as much as you like.