Your intro was nice, but you continued the pattern for too long with too little variation. The chords were an excellent addition to the song, and gave the structure of the song support.
I would suggest adding more bass chords and possibly speeding up the chords progression.
The beat sort of suits the piano, but could be done a lot better. The fade at 1:16 was unexpected and didn't really help the song. The reasoning is: the scale pattern continued throughout the whole song, and you took away the consonance. You then replaced it with a dissonant pattern, with a different tonal quality. This is unpleasing to the ear.
You did well.
Please contact me if you would like to use this in a project. We can discuss the details.