I'll second the action/adventure . . . .
Outcast - super game !
I'd like to add to the list of good, lesser-knowns,
Monet And The Mystery Of The Orangery
The Feeble Files
and the Indie games Last Half Of Darkness : Shadows Of The Servants and Out Of Order.
There are more, but I forget.
Is Discworld Noir lesser known ? Anyway . . . . it's a cracker !