A couple of duff notes, but...
I think this is a good song, but that main thing you had going against you was "1, 1, 2, 3, 1, 2, 3, 1, 2, 3, 4, % ^!" Those last two notes sounded a bit flat to my ears. Consider knocking them around a little, just to get it sounding a little better.
Yeah, I liked the tempo shift, as you played it nicely, giving the whole tune a well balanced feel. I wouldn't reccomend it as a loop though, because ti can be quite a shock hearing the slower tempo replaced by the fast stuff.
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