OK, for some reason this is 5MB large haha...
Just a few tips, don't make your animation have a large resolution, 640x480 is pretty much the maximum you should aim for, remember newgrounds can re-size your animation to enlarge it, and you wont loose any quality because flash uses vector graphics.
Secondly, you just used the 12 frames per second default setting on your flash program, try increasing it.
24 frames per second(FPS) renders a fluid enough animation, however you should always aim for something like 60FPS.
I see you used Tween, and did some frame-by-frame animation, no opinions there, we all have our art styles, it was nice, but really, increase the frame-rate or it just ends up looking like a picture slideshow.