Art style-wise, Akuma no Puzzle is nothing groundbreaking. The characters are drawn well enough to be likable.

But I praise this title for its ambition to come up with plots that break the shoujo mold. There's fantasy, school romances, omiai, demons, etc., so you're bound to find a oneshot you like here.

Characterization-wise, I like how the mangaka developed the characters. The women aren't badasses, but they're not helpless, crybaby wimps either. They're even fairly entertaining, even at the height of their mandatory naivete.

Lastly, I must especially mention the male lead in the fourth oneshot (July Bride's Yuu, who's just the epitome of coolness), who I would welcome reading again in a series.