Almost perfect.
I have to say I'm impressed with this piece. Piano shines so bright during the first half part of the song, playing touching melody, accompanied by soft thunder effect in the background. However, as strings kick in, I think it quickly dominates the timbre that of piano....that the whole piece sounds "gray", meaning mixed up and couldn't find something to lead the song in a clear manner.
Strings are strong instruments to use but you also have to be careful on their volume and reverberations as well. The only suggestion I would give you is to draw a clear boundary of the instruments better. Loudness isn't the only way to make song touching and uplifting, softness, silence or even pause also are. :)
This track does seem unfinished, but I feel that it has enough potential to make a grand and epic song with your skills. Keep it up.