First, I congratulate you on having the patience to make a medley.
Also, I congratulate you on using that sound for Bowser's roar (I assume), but only the first time. afterwards, it becomes repetitive and annoying.
The Instruments: Harsh.
The Epicness: midway.
The Medleyness: Actually, This was probably the best feature. It flows, and I can tell you actually thought about it.
ALSO: YAY! 1st Review!
I had this in mind months before I even knew about FL Studio, so yes I did indeed think about it.
Yeah, maybe I did overdo the growling a little... Oh well.
Please contact me if you would like to use this in a project. We can discuss the details.