A nice start to your animating career. I think that you've given the whole piece a nice concept, considering that there's very little show of emotion from the main protagonist, considering that he's hidden by an enormous (and dashing) moustache.
The way that you've made a slug the bad guy is a nice touch as well, though you could have gone for their common enemy, the song thrush, as they like nothing better than to pick snails up and bash them senseless on a rock, to get the mollusc inside out for a tasty snack. Still, the salty payload couldn't have killed the thrush, had the duel ensued that way.
I look forward to seeing more of your work, especially ones that have better lines - the pencil drawn effect that you'd used needs more detail, to look like you've sketched with more than just one line for each part of the drawing. On top of that, there are things like vocals that you can work towards adding in, as well as colour, but in the tradition of Hollywood, you've gone with a silent piece to start with and I'm sure you'll add the other techniques to your repertoire shortly, if you haven't already, so that you can showcase additional work.
Best of luck with your course.
[Review Request Club]