I noticed a "loop point" if you will, what you should do at these points is add something different. A bass-line that does an erratic rhythm, or an additional harmony part.
Also, your ending leaves the listener hanging. If this is what you intended bravo, you accomplished that swimmingly.
However, if you were reaching for a definite ending you need to finalize the chord more. Don't leave an unresolved chord hanging or it results in a definite drop in emotion after all that building.
Good attempt though, I look forward to your future submissions.