You apologise too much, the animation is a little slow, and you are too fearful of your recordings.
The sounds are poor quality, but that is a problem with your equipment, not your ability. However, the tone of your voice and the lack of tembre makes me picture you sitting in your room, door shut tight, quietly but akwardly mumbling into a microphone, trying not to be heard by anyone in your house.
To battle the natural buzz of your set-up, you need to be fearless in your voice recording. Say every word with heroic confidence, believe every line, and imagine each word coming from your lips is supposed to inspire a band of peasants, with lukemia, to take on the Knghts of the Round Table.
With a hefty scoop of valor in your speech, the recordings will sound far more professional. Also, your drawing is a touch bland. With effort, even the worst artist can draw a masterpiece, so throw in an extra 10 minutes on each flash session, just to add some details and maybe a gentle anecdote in the background. Like a pigeon flying at break-neck speed into a tree and puffing into a plume of feathers, or something of the sort.