Needs some work.
1. I think that the sound is the biggest think you need to fix. Try www dot naturalvoices dot att dot com slash demos and see if you can find a better voice.
2. Try making a bubble with the words insted of a top text and characters shaking. Its boring like this.
3. You surelly can do better with animation if you give it some more attention and time.
Thats the basic stuff. Try again !!!