So… that’s pretty much it. I’ve completed the few remaining levels (all of which were Volcano Island “strange request” levels), and on every level I’ve managed a reasonable-or-better score, with many levels having a score of 100. I don’t really fancy playing it again for better scores, as each level was almost the same as the last, so I feel I’ve been playing the same level over and over and over already.
Besides, the 360 is easier to control, so I could just play that if I fancied a bit more rollyball “action”.