The tutorial does not say enough about the contols but it was easy to understand after I got to know it.
It was cool to hum a rythm so I could time my jumps and slings each level, but it was frustrating when the octopus would stop, just as I reach the end, because I didn't press D for more 1 second, also it's a bit tiring to wait for the octopus to start moving because of the time you've spent not doing any input at the start of the level. Except for these nuisances it was a good game.