Hmm... well, I don't see very many glaring issues, but overall the arrangement is pretty simple and doesn't take any risks. The only thing that really stood out to me was the first melody you play, the 4th note of the melody sounds out of time, or awkward for some reason. When you play the same melody with a different synth, the problem isn't there, so I think it's just got something to do with the sequencing just being a little clunky with the first synth.
Other than that, though, it's a good remix to listen to, but it's too close to the original source tune to be submittable. If you really want to submit to OCR, you'd need to rework the structure and the melodies to make them a lot more personalized, which might just be more trouble than it's worth since you'd have to redo a lot of this from the ground up. As it stands though, I'd suggest finishing this up and submitting it to http://remix.thasauce.net/ and getting some exposure that way, because your current arrangement is too basic to pass the OCR panel.
Sorry, I still enjoyed the remix for what it was worth, but I don't think it's OCR material.