Make it a full-orchestral or mellow orchestral/trance song or (if your that persistent) a simple piano piece with some strings, woodwinds, etc. as accompaniment (but add some reverb.)
The variety on the theme was nice but highlight a consistent core melody for an intro/reprise/outro and then use some variety later in the song. (it's kinda random.)
Also, I'm sorry but that chordal structure is way too overused these days. If possible come up with something more original, and then it will catch more attention.
And avoid making it TOO whole/half/or even quarter-notey. This is okay but be sure to spice it up later. (and Tempo increase? maybe?)
Work on it. Might turn into to something awesome? Who knows? Good luck!