Samorost 2 is, I believe, the earliest Amanita game you can get on Steam, since the ones before it, including its predecessor, Samorost, were all flash games. It's a point-n'-click adventure that follows a space gnome searching for his dog.

It's okay, but there's not much reason to play this anymore in a world where Machinarium and Botanicula exist. It's simpler, with puzzles mostly existing within single screens, shorter, and not as charming. But it's an alright way to spend a couple of hours.