Effects are overused
Don't worry, it's not that bad.
But here are some things which are wrong here:
1) Effects are overused. seems to me that you've put every available effect on the piano. The effects may fill the background, but they also make sound a mess if overused.
2) The beginning didn't go well with the rest of the song.
3) Sounds too electronic. Velocity changes may help.
Practice! Try different things. It's important to become good at what you do.