Grim Legends 3: The Dark City
A well-made casual point-and-click adventure. It's somewhat short, and also light on hidden-object scenes and puzzle mini-games, but all the content that's there is terrific. It especially shines in terms of storytelling: there are characters you can get to know, watch develop and get entangled in dramatic webs.
I was a bit surprised by how good it was, considering that the first two entries in the series were quite mediocre. But the "series" is just marketing malarkey: the games have almost nothing to do with each other and can be played separately.
Note that this game has achievements that are legitimately difficult to obtain. That's rather unique for this genre of game.
I would also like to thank the developer for supporting Linux.