I agree with the previous comment. The speeding up section feels awkward and forced. Maybe if you sub it out for a conclusion, pause, then change the speed on the pickup, it might feel more natural (As well as add to the feel of the song) Conversely, the slowdown feels very nice and natural. Consider shortening the intro, song's a bit long, overstays it's welcome near the end by about 30 seconds.
Other than that I really like this song. The tremolo might be a bit extreme though, tone it down a bit and see if you like it better that way, imo it sticks out just a wee bit too much.