Well well
Not bad. Not bad at all. I was really intrigued by this piece. At first I wasn't sure what to think, but then I started getting into it, really feeling the flash. The music you chose to go with.. it's like it was made for this. "Fullfilled" it, so to speak, I loved it.
The drawings were more or less roughly done at times, but as you said, you just made something up as you went along, and it's experimental, so it's fine, no need for amazing detail. And it's not like what you've made is bad either, in fact they're original to an extent. I started appreciating how it looked after watching it a few times to be honest.
This deserves to be somewhere around the top. It's one of the most interesting things out there at the moment, so I would expect no less of it. Try to make more things like these, or continue this, whatever, just make something else I can watch, enjoy, grade and review ;)