Guitar player, looks like? Seems to be a lot of guitarists on here from what I can tell. I'm one myself, and very much in the same boat, in that I record section by section and edit the MIDI later.
I like the melody; I think there's a lot more you could do with it if you were to bring in some other instruments. My only gripe is that there is something lacking in the expression department. I'd have to look at your MIDI to be totally sure, but it sounds like there isn't enough variation in velocities.
I think there's also some room for some flourishes where there is some empty space, at least later in the piece so that you aren't just repeating the melody only. What I mean is you could keep those repeating notes in place, but at the end, before you start the next set of notes, you could add some nice little flourishes without too much trouble.
That's what I would do, anyway. Just my opinion of course. It's still a very nice little piece as it is.