I bought this day one upon its release on the PS3, and it remains one of my favourite games ever.
The graphics haven't been altered (neither better nor worse), and the audio is amazing on headphones.
Touch screen controls are passable, but a bit obtuse; I often find them both over and under sensitive at times, but the most confusing aspect is the speed control. Everything is molasses slow; to be clear not the frame rate or processing speed of the device…where the PS3 analogue triggers could go from a light press/crawl to a deep press/sprint, the iOS version only has crawl, which severely diminishes the sense of flying as the wind. 😕
The other critique is there appears to be no manual or text anywhere—even online—to describe what the two icons mean in the menu (camera with opposing arrows, and gradated chevrons).
Aside from the occasional glitch (audio dropping out, partial flower models, the red flower of level two and all red petals disappearing), it's a faithful reproduction of the console experience, especially with the accelerometer controls. Better the larger your screen and higher your audio fidelity. 👍👍