Good work
The beginning sounded a little off beat when I first listened. I assume that was intentional. Can't say I liked that too much, but it was an interesting touch.
By the time the song sped up I could hear it come together with a little bit more structure. This is a very unique song with interesting rhythm and structure altogether.
I really enjoyed this. I probably wouldn't have reviewed if I didn't think it was good. The melodies on the right hand are great and the variation in the chords you used go together well and kept it interesting throughout.
A couple things I gotta say against you is that, first of all, you should use more of the piano. Most of all go up and hit some of the higher notes, but the lower notes too. I don't play piano a lot (at least not very well :) but it sounds like you were in the same two or three octaves throughout the song and it started to get a little boring. Secondly (and I might be mistaken), it sounds like a lot of the left hand is playing fifths or "power chords." Whether or not thats true, I thought a lot of the time it sounded thin or hollow. Maybe its just the way your piano sounds, and maybe my first suggestion would have helped. Personally, I'd stray away from all the fifths. Instead maybe try some octaves, lower bass notes or play higher on the piano with the fifths.
Like Dexi said, I can tell you had fun playing this. Its a good song altogether (I don't wanna make it sound like I don't think so).
One thing I gotta say is I can hear expression in this song. Its got "feeling" if you know what I mean.... its the WAY you played this that really makes it good. Among other things, thats what I really liked about it, so keep it up.
Oh and by the way I don't get on Newgrounds very often anymore. Just thought I'd say that since you asked me to review this over a month ago... anyways, if you have more you want reviewed go ahead and ask and I just might. Otherwise, I hope my advice helps you out.