Tip: When determining a time limit, remember that players won't be as familiar with the level as you are. If you normally complete the level with the timer around 100, others might run out of time on their first try.
First, having two channels play the same notes is unnecesary, and their instrumentation isn't the best either, using only 3 channels (main melody, echo, background melody) would be better. I also recommend using @13.
Lastly, the txt could use better optimization.
For example, this: