I really like the changes you made! But I still got stuck at level 7....
Maybe I just suck at platformers. But I do think that you need to put in some more friction, and with level 7, you did something similar to the old level 3. You introduce a new element, right after a some challenge and you put the player in a tricky situation with it. There is very little telegraphing with the air thingies and every time you die, you need to redo all of the start of the level. After 10 minutes of doing stuff that quickly became busy work and dying in the end, I just gave up.
But I don't want to sound too negative, in the end I had a lot of fun, even after a couple of minutes on level 7, and I really like the simple mechanics and how you make them really challenging!
Sad to see the classical music go though...