Agree with others in the music is really great for this! Can jam to this for a long time.
In story mode, the first character was actually the most difficult for me for some reason. Largely was just running into time pressure and getting the right colors to clear before it reached me. I was able to beat the second boss and the final ringleader (freeing everyone from their bubbles!) much more easily. Pretty fun overall game and I enjoyed the extra story layered on top.
Nice work!