We're taking our time to get the iPhone version of Mixtikl "just right".
After playing around with Mixtikl on a real device, it became obvious that the general inaccuracy that you get with touch-only devices using chubby fingers :) meant that the Mixtikl skin needed to be "chunkier". This is as opposed to pointer-controllable devices like most Windows Mobile PDAs, where you can have a UI that supports smaller elements that can be selected accurately with a pointer device.
We've come up with a nice solution to this problem, and in the interim have been extending the underlying .partikl file format to take better advantage of local sample files (in Ogg and DLS format) used in the Tiklpaks. All will become clear when we release the next version of Mixtikl!
These changes are combined with other user-interface tweaks, which we think make a great deal of difference to the usability of Mixtikl across all our platforms.
We can't wait to release this new version ... but won't rush it. :)