Great Stuff!
I watched this little short, and it inspired me to watch the rest of your submissions. What you really need to do is make a whole episode - a long thing. These have a sort of clerks vibe (aside from the video store aspect, i'm talking about customer relations here!) Though these are great, their potential i feel is not fully explored within their timeframe.
Also, when you get to that point, i feel you should have a co-star on it. When you start making longer cartoons, or hell, even just MORE cartoons, i think you'll find that your little video clerk can't hump the whole thing on his own.
You've got a great start for a good series - i'm adding you to my fav' list so i can keep tabs.
Oh and your sound quality rocks - good work!
D