Liked the concept, quite original.
The controls are a bit harsh, it's hard to change the volume while jumping around.
Could not get past the first green pad, I think I should press jump while am touching the green pad?
You should check out "coyote time" from Marks video "Why Does Celeste feel So Good to Play".
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The green pad is an auto jumper, the louder that part of the audio is, the higher you auto jump. This way the audio and level design are joined together, just like for the first slider where you have more platforms the louder it is. Try to get the volume to a high enough level to jump through the gap!
As for coyote time, I thought I put it in but thanks for telling me that it is in fact not in the game!