I like rhythm games... but I'm also pretty terrible at them! Despite that, I made it through the two stages that seemed to be available. (Only 2 stars lit up for me)
I liked the variety of notes that you had to pay attention to. They came pretty fast on the second level, but as I practiced it went from seeming impossible to doable. I'm not sure how I felt about the different colors "maxing" out at then needing to be cleared. The controls for the diamond were hard to use on my keyboard, which made that basically impossible to do. Based on other comments, they may be setup for another type of keyboard. In the end, I beat it without using that feature at all.
Nice work! I hope you add more stages, and maybe customizable controls!