This is what I call a perfect first timer submission. It's not a test, it's not a trailor, but you took the time to make something, and to see it through.
The 3 months paid off because this was great for your first submission. Great action, great sound effects. The only thing that I could suggest is her anatomy. Some scenes her face seemed pretty chubby. I would recommend making a character sheet, and draw what she will look like from different angles, so when you draw it in Flash, she still seems proportionale.
Otherwise, fantastic job.