Meh
Considering you didn't have to write any of the tune yourself, it's not that great, to put it bluntly.
A remix is about re-mixing the original track completely, so that all you can hear is the basic themes, and sometimes melodies. However, you didn't change up the notes much at all. This makes it more of a re-arrangement.
And with a rearrangement, you have to do a spectacular job with the instrumentation, which you didn't, really. It's one synth playing all the notes, and then the drums. Not much depth to it.
Sorry to be so harsh, but I don't think you should get a higher score just because you used good material to start with. A good artist should be able to start from a decent song, and make it spectacular.