I actually really like this, there is a superb blending of color up and down the blade with real care and attention given to order of the colors. The hotter colors are at the top left which looks to be the light source for the reflections upon the blade, which is really neat.
Colorful and well drawn, I suppose it may be slightly limited by scope of use but I do not believe that a niche icon is by any extent a bad one, especially given how wonderfully established the colors are in this icon.
Great work!