Great animation, you can see alot of work put into it, from random background animations, through crazy exact lip sync, to focus on the the plans of the scenery. All this needs alot of work and planning, and were executed brilliantly.
The ideas of the beatbox battle places were also very dramatic and well though: wind blowing in hear, slow fog, moving sky clouds, it all counts as a good way to promote and make your material more dramatic, making the battle look more fierce.
As for audio, this "track", it sounds silly (not a fan of beatbox) but it is clear that it also needed alot of work to produce those sounds at this speed, you have to respect people if they can do something to that extend.
All in all, great animation. I understand the author wants to underline being creator of the series and don't mind reviewing his work, even if its an animation posted long long after its premierre in youTubs.
P.S. Could you write a statement explaining why you and bulgariananimations post some materials separately, even if you are (as far as I am aware) the creator of most of the work.