I don't intend to discourage you, but it's hard for me to listen to this, honestly. I'm not familiar with the source material, so all I can really focus on is the excessive 'machine gun effect' of the piano hammering away at the keys at the exact same velocity time and time again. Without any meaningful variation between the volume at which the notes are being struck, it all blurs together.

Granted, whatever piano plugin's being used in the first place isn't going to be winning any 'most realistic piano software' awards any time soon, but with the right amount of attention in the right places, you can make even crappy software sound good -- sometimes even great.

I don't know if you simply downloaded a midi file of the opening (I just did a quick search and found some results) and used that to create this rendition, but if that's the case, I'd highly suggest altering the velocity for each and every note -- or at least enough notes to ease up on the aforementioned machine gun effect.

Hope that helps, and good luck with the final rendition of the track!