I came across this again after a while now and feel like I need to say something.
Real talk, this map has inspired me a lot and I just want you to know how amazing I think it is. It's probably one of the most playful maps I've seen and is played by itself following the song exactly how I imagine it should be mapped. This is what I strive to produce as a mapper :'>
Random suggestion: Replace default-7.png with default-9 so that the combo literally spells out "1-2-3-4-5-6-9".
Might be slightly confusing in the rest of the map, but it rarely reaches 7 combo anyway, and most of the times that it does, it's hidden behind a stream. You could always just NC in a few places.