Speaking of BIT.TRIP BEAT control methods, a dude at my weekly boardgaming night had it on his iPad and I beat the first level. I'd never take it over a Wii remote or mouse, but it did have a very interesting feeling of "directness" in lining your finger up with the path of the beats, rather than moving the paddle abstractly with a controller.
I would still give my nod to Wii remote controls over a mouse. The twist-controlling is like the Arkanoid-nob.