It seems you have a steady beat going in the background, and sometimes it leaves for another one. I really don't have my metronome around to see if it keeps track, but my hand says its fine. :3
Its really hard to make a song like this, and let it be different, since they almost have the same beat. But your use of music in the front goes from a little 'hop/step/jump' into a 'medival' kinda thing. Mixed together it kinda sounds like a remix of an old classic. Its really good, though!
Please contact me if you would like to use this in a project. We can discuss the details.