Great job!, My only sugestion is maybe making the piano quieter, the drums (specifically the cymbals) louder. Maybe also the square synth a bit louder too. Still sounds really good!
But I think that for the Grand Piano you should put these effects (that's my opinion, if it turns out I'm bad and it will sound bad) https://pic.infini.fr/XZ2z6TqI/n04aJyEO.png