I saw your article on your Bokstuff (linked from HN) and downloaded the game because your description intrigued me. Appealing to players that want to "reach a zen zone and win" sounds like a great idea. I tried out the game for a bit and I like it, but I wish I could control the music. You made some decent choices in tunes, but why can't I play my own? (And don't blame PhoneGap ;-) I can appreciate not having any options for the user, but the cutting off my playlist and introducing your own techno-beats feels really intrusive. In keeping with the "zen zone" thing, there's also an argument to be made for having to cope with the challenges thrown at you, but I would question then what you're actually trying to accomplish with this game.
Overall, I think it's cool. I'll definitely keep trying to beat it and I'll be looking forward to v2.
As for performance, I'm on a 7, and you know that's butter so no complaints there. Thanks for taking the time to optimize your code. Keep up the good work!