I'm not 100% sure that his uploads are his complete works for each game, since Epic Yarn is missing like 15 original tunes and the Iwata Asks interview with Ishikawa and Ando suggests they did little, if any, music besides the final world stuff.
I like this unused tune from Woolly World a lot, esp. starting at 1:08:
https://www.youtube.com/watch?v=0XFpnHPoOvA