this is coming along nicely, i think you have some room to exeriment and explore those 'quiet' low register sections in the opening, see if you can bring the total amount of sound down just a bit and play with the 'pacing' of those little bam bam bam, bam bam, bam bam...you know what i mean, really make those spooky/ominous almost think colors, those would be shades of dark grey, dark navy blue/purple, then suddenly , POP, the higher sections hit suddenly out of 'fog' they jump out and almost scrare you silly, think someone is falling asleep in the front row and you want to wake them suddenly, then as quickly as those 'flashes' of 'brighter color' appear, they fade back in to the 'dark fog'...
i know that sounds way way subjective and probably too abstract to mak sense but this opening section can really set you up to provde incredibly contrast with the faster later sections quite nicely, also the ear is going to get a lot of sound thrown at them, let really 'savor' the quiet while we have it, it makes it so much more interesting. again not that it isnt already, but this piece has a bit of schizophrenic bipolar disorder going on, really make me want to thow some prozac into the belly of your piano, or call a priest...