That's one pretty good flash
Well drawn, well animated, good timing, nice music choice
Not sure that Valhalla is what you're looking for in this, but meh. I think you have to keep it less pure animé at some points. You can make the animé work, but you need, at times, a little more detail in your artwork. A little rough but careful shading can work wonders.
Of course, I'm picking out the problems and things for you to improve, but I still feel that the movie was well made, and you put a lot of effort into it. Keep it up, and keep improving, and you could make it big.