Soundboards are not flashes
Soundboards are things put together for amusement, however they don't deserve to be considered a full length game or movie. From what I can tell, the only things there you made yourself were the buttons, consisting simply of a rectangle and text.
Since it's just a collection of sound clips, spice it up a little. Give it a nice background, draw the characters yourself instead of copying and pasting. Make a nice selections screen. Say, place the character on top, with a left and right arrow to cycle through them. Display the sounds in a nice row on the bottom, or have them glide in somehow. And also, when you click the Go Back button, it takes you all the way back to the main screen. Try to fix that, so it takes you back to the character selection screen, and if you click Go Back from there you go to the main title.
Finally, when people give you constructive critiscism like softmints, don't get uppity and defensive. The biggest mistake anybody can ever make is to think that they've made something good. No flash is ever perfect, there's problems with everything, and for some reason people like you take it personally.
Relax.