Thank you for your feedback! The confusion for how to play is my mistake, you are required to morph into the shape as closely as possible to when the shapes are aligned. I do think I could have done better to explain that and I also agree with giving more positive/negative feedback to the players based on timing.
Those are actually pretty decent scores! I was quite tired from making the game and hearing the songs over and over that I never got round to doing a full play of the levels competitively.