Even the tempo up
The start was almost perfect, then you started messing with the tempo and it fell apart for me - it's just a sample piece, which struggles to really represent a tune of any discernible value.
The speed that things move from the really slow and laborious to the ultra-fast is obscene. Messing with tempo should be done subtly and slowly, so that people don't realise what's going on. Yours is far too great an increase or decrease in tempo to cut it.
Basically, what I'd recommend is heading back to the drawing board and getting back to the intro, which worked well and just tweak it slightly, so that the really annoying higher notes of there cut out there sooner, giving you a decent start. Don't ratchet up the tempo and come up wit a decent bass beat as the basics, then move on and develop the melody.
[Review Request Club]