Yeah, I also think it could use some work. Especially the intro. (Which is arguably the best part)
The most jarring part is maybe the instrument you used for the... uh... that one at the beginning. The one that fades in when the bells fade out.
Of course, it's such an abstract sound that it's difficult trying to replicate it. (Actually, I took a listen to that instrument in the soundfont and in the correct pitch it actually sounds like a voice. Like someone saying "Iho-ge" or something but of course, the compression just makes sound like garbled bit salad.
It reminds me of how in WWinc. there's this bit in the first level of the microgame called Cymbalism (where you catch notes between the cymbal).
On the GBA it just sounds like.... something.
(at 0:09)
But if you hear the Gamecube version it actually sounds like a human voice!
(at 7:33)
I wonder what that means.
So yeah I bet it's actually a distorted voice clip.
AAANYWAY...
When that "instument" first kicks in it goes kinda crazy, right? Going up and down in pitch and all crazy while the bells are fading out, right?
But in your version, Jack it stops being crazy a little too early.
Also, the drums which start around that point could be a bit more audible.
Another thing: At 1:00 into your video that "instrument" (I'm gonna call it voice garble from now) The voice garble is missing completely. It should be rapidly increasing in pitch, reving up, you could say. And the part after that just sounds kinda weak since the instrument you use doesn't have the same harshness to it.
PS. You should make the animation of Wario being nervous much faster.