Poorly synced audio. The keyboard or whatever this is supposed to be looks like it is drawn in paint. Well actually the whole animation does. Didn't make an effort to create something decent. At least keep the fingernails the same color. They don't even have to be the same size just fill them in with the same color. I dont know how much time you intended to spend on this but why do you even animate something if you only do it halfhearted. Shading would improve this by a lot for example and isnt that much work if you only have one object that is moving.