Well made, but vastly flawed
When it comes to rhythm, flash is very limited. The note charts are unresponsive and awkwardly written. For instance, you should not be pressing two keys for an instrument not playing chords, and you shouldn't be quickly switch from leads to background voices just because there is a rest and an interesting fill in the music.
Considering what you had to work with, it shows you know what you're doing, but the idea was flawed from the beginning due to the lack of fundamental elements.