I freakin loved this game, and I typically never get into adventure games!
Overwhelmingly positive reviews on Steam.
The less you know about the game, the more you'll enjoy it.
I actually originally attained this game through less than legitimate means, but I'm buying it to support the devs (and some charities through Humble Store).
Edit: Cheaper than G2A!
Edit 2: Possibly cheapest ever?
Should I play this or Before the Storm first?