Well, you can't win them all. ^_^
I think the tutorials are the ones that people would sometimes love to jump the gun by just hitting Go (it doesn't appear right off the bat unlike the actual levels themselves... not to mention they restart and just do said instruction again, followed by the same delayed appearance of the "Go!" button)... that might be possible
I don't exactly have any other notes. Droppy's movement is predictable if you can get used to his bounciness. ^_^