I have to confess, I only "read" this book in the Tate Modern bookshop, so I haven't heard the Bill Frisell soundtrack that you get with it, but I have to say that this is quintessential Woodring! I suppose it's intended for kids, but it's also an excellent primer for anyone not used to the man's work, as it has the same oneric, and sometimes vaguely horrifying quality that you get in the Frank books- poor Trosper is scared out of his wits by squamous things that are often "off-frame" as he scuttles about trying to regain his lost ball.
Anyone that hasn't read any of his other work should go from here to The Lute String (Pushpaw and Pupshaw might also appeal to kids who liked this- it is strangely absent from Goodreads) or dive straight into the world of Frank-although this last is probably crossing the line of grotesquerie for littl'uns, what with the diabolical, opportunist Manhog and unsettlingly unreliable figure of Frank's (Faux) Pa.