Mediocre.
My immediate first complaint is the dialogue. If you're gonna force me to read it as opposed to hearing it, have the frame stop and give me the option to move forward given certain controls so that I can read at my own pace. Some people will get bored after reading the dialogue when it doesn't go away and others won't be cognitive enough to fully read it before it disappears, limiting your audience. The type of ActionScript I'm referring to isn't at all hard or difficult to implement. It's the bare basics of ActionScript used to program quiz games.
FrameActions;
Global Functions; Timeline Control; Stop Frame
ButtonActions;
Global Functions; Timeline Control; Play
It also helps to have Script Assist mode activated so you have better control over how your button works.
Your action is pretty good seeing as how it's reminiscent of AlvinEarthworms ideals of sprite animation. But there are parts I have to mention, in the beginning montage, when the Toadstool whom of which is tied up is falling through the air and is silhouetted, it's clear that he's supposed to fall behind the bush, not infront of it. You need to have better control over the Layers in your Timeline. I also noticed that you seem to have trouble in rendering your backgrounds. Just watch the introduction scene, the structures in the back don't connect with each other.
Above all, I'd say that you're doing a good job, for an amateur. You need to learn how to properly render your backgrounds. Though to be fair it is certainly better in its suspense than that other submission "Sonic Shadow Duel" that's made slightly more success then you have and I can tell you why. Your icon is just the default "no icon for this submission" icon.
This isn't the old days when you had to have a 46/46 height and width GIF image for your icons anymore. In today's NG it's far easier to create an icon for your movie. You can upload any format at any height/width you want and can crop out the icon out of that.
If you have the time, try and fix these flaws before you advance with any latter episodes okay.