Curiously, someone else said that they could see how the song affected the level (even though it doesn't really, because the data comes from reading the contents of the file and not the characteristics of the music). The level generation gets more obvious when you see it working with different songs, but I'll have to have about fifty more different possible elements before they become really distinct.

I was thinking of Vib Ribbon when I made this (which seemed to have the habit of making really slow songs extraordinarily fast and difficult), but I remember what you mean - it's Audiosurf. Now I wonder if I could flavour the level data with things taken from the ID3 tags of the file or something...

And yes, I should probably recommend a reinforced left mouse button.