Ask HN: What do you think of our iPhone App - Vummy?

I welcome some constructive criticism on an app I wrote for a client. One thing I've been told is "tap to move the mouth" isn't desirable. It was a conscious decision on the design because the creative guys wanted you to feel like a ventriloquist. Kids seem to really like it and we have a Vummy4Kids coming in January.

Free Version - 2 characters:

    http://itunes.apple.com/us/app/vummy-lite/id481895640?mt=8

Full Version - 12 characters:

    http://itunes.apple.com/us/app/vummy/id480015458?mt=8