Some advice
I've been watching through some of the SiloZen series and I figured it's about time I offered some constructive criticism. However, I'm not going to talk about the plot too much because, while I don't like it too much, I realise you're quite set on keeping this series going and I realise a lot of people like this kind of series, so that's fair enough.
Anyway, I think you really need to start thinking about progressing your skills as an animator and finding a consistent drawing style. The scene with all the characters in perfectly highlights your need for the latter - every single character seems to have a different style of drawing, including ones that are blatantly traced (most of SiloZen's body is obviously copied from somewhere else), ones that are fully-drawn but quite crudely, and some that actually have stickmen bodies which frankly makes no sense. Going back to the animation itself, you still seem to move the characters about with really basic tweens and this makes the fights unbelievably choppy.
Don't get me wrong, I'm not trying to criticise you for the above, I just figure you should take a little time out and really practise your drawing and your Flash skills. You seem to be making these animations at a really rapid pace and while you're adding superficial improvements like slightly better backgrounds and more traced stuff, what you really want to be focusing on is using frame-by-frame animation and drawing everything properly. I mean come on, you've said above that this animation took you 'forever' to do, yet judging by the date you submitted SiloZen 7 I'd say you actually only had about a month to make this one.
Just give yourself more time, that's all. The people who like your stuff on NG aren't going anywhere, so why don't you spend a good couple of months (or more) on SiloZen 8? It'd be awesome if you could learn stuff like perspective and drawing characters from different angles, as you'd then be able to put more depth into your animation and it'd just generally make everything look a lot better. Doing voices for the characters would also be great, although that might be a lot to ask.
One last thing - you may already know this, but if you import a song into Flash and then use it in a cartoon, it doesn't matter if the cartoon itself only has about 20 seconds of that song in it, the WHOLE THING will be contained in the finished swf file. This means that even small cartoons (like this one) can end up with ridiculously large file sizes, so what you want to do is get an mp3 cutter (there are loads of free ones online), cut out the part of the song you need, then import that into Flash. The size of the swf should be dramatically reduced and it'll mean people won't need to load 10mb for two minutes of animation.
So, there you go.