lots of neat stuff going on in here. the arrangment is fun but starts getting a little repetitive about halfway through. the biggest issue you have here is the mechanical piano sequencing - try editing the timing and velocities of individual notes to give it a more humanistic feel. your instruments here are a little on the vanilla side, kinda as if they came out of a keyboard soundbank, which is fine, but they lack personality. try playing with your FX and sample settings a bit more and you will come up with some unique sounds.
the mixing, while pretty clear, is a little harsh. i had to drop my volume a couple notches for this.
anyway, good work for a first remix! if you've already subbed this, be aware that you're in for a bit of a wait, and (not to be too direct here but) i would expect a resubmit. you definitely have the musical chops, just need to beef up those samples a bit and work on humanizing that piano.
oh, fixed the thread title for ya too