A surprisingly satisfying collection, considering that, according to the author, they are unfinished.
The theme is that this is the author's Idea File, wherein he's deposited ideas that he's begun to one extent or the other to develop, but are lacking (in his opinion) a satisfying conclusion.
While it is true some few are too short, I wouldn't consider the majority lacking in this sense..., they don't generally give any sense of being incomplete, like a cliffhanger.
Definitely Worthwhile Reading As Is!