Not bad but not vary good either.
I liked the intro, but the build up took way to long to keep me really interested. And then when it did finally build up, it didn't change much. The synth got a little 'darker' and the bass kick got a little louder and muffled. I think its a great Idea for a track, but I think you need to work on it some more, maybe change up the melody a little after the build up, and definitely try a different kick.
Don't give up on this track though, its got a lot of potential.