Not too bad for a first pass
You've got a handle on animation. With some practice you will be making some pretty impressive stuff. The only comment I have for now is that you need to get a hold of your audio. You shouldn't be using stereo sound or full length songs. Stick to shorter loops and compress your audio (publish settings screen). Play around with different quality settings and watch what it does to the file size. You should be able to find a happy medium between quality of music and filesize.
Good luck in the future. You need to get your hands on a copy of Flash so that you can improve your skills and start chruning out some great stuff for Newgrounds.