Yes, there are 11 flowers, you probably gathered the secret one by accident. I planned on making a secret room but ran out of time so I just put it hidden. (you can only see the light it emits)
When it came for the jump notes, I agree that it's not blending well. I just had this idea in my head that I wanted to try, I thought it will make completing a stage more satisfying when hearing the notes play out. My favorite platformers make the sfx almost addicting when you complete the stage, and I wanted to shoot for something similar. (speaking of shooting, it's like shooting a basketball. the sound of the net when you get that in is about 80% of the reason I like playing basketball)
Thing is, I wasted so much time on it and I didn't have enough time to replace it so I just kept that in.
Thank you!