you use GarageBand?
I suggest Logic Pro X if you use it, because Logic Pro, though pricey, is SO much better than GarageBand is.
Now then, on to the review...
I like the bass, though it could be a little stronger.
The drum line feels kinda incomplete; maybe put some quiet reverb on it or make the kick stronger, or both!
The buildup is pretty weak, and the drop is really really disappointing...
In the buildup, change the beat up. While that beat is simple and easy to use, it really creates this sense of no mood changes. The buildup needs to have higher energy than the rest of the track, to show that something epic is coming, and that brings me to my next point.
The drop is disappointing. Breaking it down was a nice idea, but I'd say that it doesn't give the impact I was hoping for.
Maybe, if you want to break it down (though this is personal taste), start with the breakdown, then make a drop impact and go on with the drop. Again, that's personal opinion, and a suggestion that you can completely disregard if you like.
Also, make the fade in from 2:33 to 2:50 shorter.
4/5