I was hooked by the melody at first, which is really well composed. However, I feel it's used too many times with too few changement, a part B with an other melody/chords could have been neat! I feel the pitch shift thing is used too many times too.
Also, it was lacking from a fight theme energy. I think it's mainly because of the drums which felt a tad too weak. But overall it was fun to listen and was in character for Green Tail!