I'm going to echo what Kale said about the UTAU's voice not being on the right pitch in some parts. Also, there's those parts in the tuning where the pitch goes up at the very end of the note for effect- I'm not exactly sure what that's called, but I think it may be best to have that effect sort of "spread out" more. Not to remove the effect completely, but to not have it used as often, or maybe to have it not go as high.
(But that's simply my opinion based on what I heard, so if you like it, then by all means feel free to keep it in there. :3) Aside from that, everything sounds great! Good job! I hope to listen to the full version if/when you finish it.