A little empty in the first part, and....
As it is right now, the first minute is a little empty and could use more to fill it in. After the first minute, we find out the piano never changes so that puts the entire song on the repetitive side and I kinda wish the piano would change it up more. Your ideas are nice, but you hold them out too long with not enough change.
Good work, but maybe change things up to keep it interesting. At least change the piano up if anything.