Heeeeey, Ecw! Pretty decent first flash. It's better than most peoples first flashes for sure! You had a lot of good elements in it like sound effects and you had pretty simple yet niecly detailed backgrounds in its own right.
There are two things that I could help you instantly make this Flash better. First thing would have been to compress your sounds in the Publish page in Flash Ctrl+Shift+F12 . Click the Flash sub-menu and toward the bottom where it says Audio Stream and Audio Event....personally I just change both of them to lower settings but not sure if both are necessary. Turn the compression to MP3 , the kbps to 24 or so (more is better quality in sound...more memory and less is lower quality in sound...much much less memory). 24 kbps sounds pretty normal but you can tinker with that. Set the Stereo type to Mono and that should make your file size lower and make this Flash more viewable to more people etc (at least that's what I think made the File size so big, heh)
Lastly, add a Stop Action command inside the very last frame of the flash so the movie stops playing and doesn't loop. I don't know the exact way to make the Stop command in text...since I use Script Assist on ActionScript 2.0 and it types it in for me :/
You may already know some of this but just makin' sure ^,-
Pretty cool Flash and I give you a 10 and a 5 since you're a bud.