Nice job. My only constructive criticism would be that most animators who are starting out feel that they need to move their puppet all the time. Pauses add a lot, especially when you want to show a character is thinking. Think of when you watch those crazy TV shows where a host in front of a live audience reveals that an accused man is not a father. The reaction is usually (just as an example) ...... sits still and listens calmly and intently. Then a surprised facial expression is held and then finally he jumps up and down. So in the beginning of your film when the rat is listening to his guitar foot pedal (nice idea) he might be more animated while talking than he would when he's listening.

Otherwise good job, you stuck to a story, the voice work is good and you did a HUGE amount of animation for just one person.