Alight, let's see...
Right now I'm going to be talking from a purely production viewpoint because I'm entirely unfamiliar with the source.
First thing you might want to work on is humanization, because this sounds very mechanical. You want to have more expression written into the piece, portions where it gets louder or quieter for emphasis (or louder or quieter in general, but certainly not at random). I think the first step right now would be to sit down and look at your velocity values and decide where the song needs to be louder or quieter, whether or not a chord needs extra emphasis or not, and then change the velocity accordingly. Good luck