Talking Hand for iPhone

I am making a small entertainment app for SigmaT.

The idea is very simple:
You see an animated hand on the screen. The hand "talks" as it opens it's "mouth" and sound samples are played. It really doesn't say anything - just continuously mumbles a few words and phrases in english.
To start with the hand is in listen-mode: It appears to be listening to what you say. It says things such as "aha, year I understand, she said that, oh really?".
If you tap the screen then the hand becomes annoyed and begins to tell you off.
If you drag your finger across the screen the hand becomes happy and gives you compliments.

Thats the basic app functionality.
It needs to have a profesional look and feel to it.
It needs to be very original.
I need to be able to do everything in 2 weeks.

There are some issues:
-How to make the visual appearence look professional, appealing and not take up too much disk space.
-How to get the voice working.
-Tweeking of the "feel" of the application (ie. how many taps to get the hand angry?).