Welcome to the advent of audio games on the iPhone and iPod touch. Aurifi is touted as a completely new gaming experience, devoid of graphics and putting the emphasis of interaction with soundscapes. This isn't like the rhythm and music games you've known.
"[Aurifi's] innovative gameplay allows players to interact with sound in the same way video games let them interact with graphic objects: as they progress they explore a vast array of original sound components and audio effects, blending hundreds of bespoke musical phrases to create thousands of different permutations."
You'll have to hear the demo for yourself to understand how you play with Aurifi.