Yeah...
Great song. Like it's been said, the first transition (:27-whatever) needs to come out strong, not into a build up. Also, the song doesn't really change much from :30ish to 1:50ish... And even then, it's just a different sound. Try adding in a second tune in there, not something completely different, but something to mix it up and keep it interesting. Great sounds you've got so far.
*(Not sure if you've mixed yet, but the bass-saw is a bit loud in some parts)