This was pretty good. However I was disappointed that the actual gameplay in its basic elements had nothing really to do with sound. The pitch shifting mechanic sounded great, but it did little to overall effect the gameplay. The Red to Blue slider was cool. As some other reviewers said, it would have been nice if there was some middle ground options for the slider rather than just opening a door every time it got to the maximum or minimum pitch. I guess there's a little fiddling the player can do on the slider when he's dodging the spinning gears, but other than that, I saw little options or cool quirks on the system other than basic platforming.
I really like the music and I played for a bit, so this was a good game. I got to level 8. Don't know how many more there are, but yep, that's it for me.