Fantastic work!
I've recently been getting into Chiptune (but just barely), and this is an excellent example of where I'd like my skills to be in a number of months. Favourited both you, and the track!
The melody in this is very well conceived, and progresses nicely throughout the piece. I like the way you used breakdowns (like the one at 1:20), it adds a lot of ...something... to the track. Something I can't find a name for, hah.
Awesome continuity, and great progression of the entire piece. My only 'complaint' would be that I'm not sure that the sound that comes in at 1:58 fits very well with the preceding parts of song. It just sounds... different to me. It's not bad though, just something for you to think about.
Keep up the awesome work!