First off I just want to say awesome sound clip.Defintley something different. Overall not a bad start but there are a couple things that could be worked on.
I noticed mostly (and I had this problem for a while) is that the movements of your characters look like they’re hitting a wall. For example when the girl first raises her hands, outwards and then they just kind of stop. Although you move the arms nicely right after she says “disney land”. The difference in what you did there is they slowly keep moving. Remember the body is always moving.
Second is their are a lot of symmetrical poses. Try to make some movements asymmetrical, it really give the character a more life like feeling.
I really do love her expression when she starts screaming, that part there is really selling the piece spot on.
As for any other help, really watch other animations that are good and play them frame by frame or just watch them over and over…it really helps. Also you might want to work on the composition…there is a lot of negative space towards the left. I know it’s just an acting piece, but it’s still always good to have a nice composition.