Hi Enrique
At first hearing ( with headphones and my default midi device)) it sounded like a nice organ composition.I took the liberty of saving as Mid.file and played your piece in my default synth-engine with a big soundfont and listening through my monitors.And there it is,the beginning of a nice symphony with much more definition in all the individual instruments.
So please go on and finish it !!
Cheers
Djim