Not as special as the first one for me (which could just be the age I'm reading it at), but still great fun to read. The Minnipins have heroisim and bravery thrust upon them, but rise to the challenge. The heroes we came to love in the previous book make more than a cameo appearance, but are not the protagonists: that role has been taken by a new set of Minnipins from a different village.
I think what I like best about these is there's a sort of kindness that pervades this, but it's not all unalloyed goodwill. Gam Lutie's determination to hang on to her treasure in particular occasions quarrels. But the characters do the best they can, in difficult situations, wihtout villifying one another. It's a bit like how I wish politics worked! (More recognizing we all want the same thing, we just differ on the best means to get it).
I'm a bit sad this is the last of the Minnipins series (I'm sad whenever any series I love ends, begin with the heartbreak I felt reading the final Mumfie as a child), but at only two books I think I shall survive it. I see she's written other things, and I like her calm, easy style, so will seek those out. (It helps that I didn't realise there was even this 2nd book until only a few years ago!)
(Note: I'm a writer, so I suffer when I offer fewer than five stars. But these aren't ratings of quality, they're a subjective account of how much I liked the book: 5* = an unalloyed pleasure from start to finish, 4* = really enjoyed it, 3* = readable but not thrilling, 2* = disappointing, and 1* = hated it.)