Torchlight from Runic Games, using the game's lack of Achievements and Steam Cloud support as an excuse to do so, haven't you? Haven't you?!
It's alright (and we're sorry for yelling)! But we had to get your attention to tell you that Steam's benevolent overlords are already thinking a few steps ahead, adding the aforementioned Cheevos and Cloud support in an update last night as well as dropping the game's price by 50% for the duration of the weekend. For $9.99, you can venture into the land of Torchlight and click to your heart's content -- there's even a demo if you're so inclined. The deal last's until Monday, so let's hope you're an expedient Steam user as well as a conservative one.