sorry, but this really is bad
the animation is terrible and the storyline is bad. everything about it is pretty bad. i can appreciate your effort in this though. its clear that your a beginner and trying to learn so thats good. just keep working on everything. practice makes perfect.
BTW = tau , if you will notice, have hooves. not feet.
suggestions:
1.improve the animation. watch other animations and drawings and study the styles VERY CAREFULLY. then practice doing them.
2.research up on the backstory of Warhammer 40k
3.make a more coherant plotline (what planet, what system. why when who what where? just remember to make things a bit more clear)
4.learn to use flash better, there are a lot of tutorials and stuff online. also if you look hard enough there will be people willing to teach you and im sure most flash artists will be more than happy to give you tips.
5.like in number 1, observe flash films or movies and how the characters move. theres a specific way people walk and move and how light reflects and positioning. look at it carefully and try to remember it and be able to immitate it in your movies.
6.the shadow in that battle scene goes too high. (SHADOWS DONT GO ON THE SKY)
7.pace it better. and maybe use some voices or place the text boxes better.
this needs LLOTS of work. id scrap it and make a new one.