The graphics are great and I also like the story and concept. Once I got the hang of it and got into the groove, I also enjoyed your beat mapping, especially how you included the right hand. Well done! :)
I believe the brutal difficulty, the others mention as well, stems from a weird perspective visual problem. Maybe the scaling of the notes over time that stops right before the hit zone? I don't know. I can't quite put my finger on it. But it leads to you expecting the note to hit the bar earlier than it actually does. If you play to the beat and don't pay attention to the visuals, the notes are on beat quite well.