Really? One freaking level? That's far from enough to really test the game! That's not even a demo! Your description of the game is actually false advertising, there isn't 60 challenging levels, there is one with no mention of a demo except when you complete it.
Now, for a review of what I could experience, and it isn't a whole lot, the game could be good. The music is good and that's the only thing I can say for sure. Give me more levels so I could really test it, see some difference in the levels design, something to really have an idea of the game potential and I'll be able to write a better review. Right now, I can't even give this "game" half a star. A good idea would be to let us try something like 10 levels of your game so we can actually try it and offer better criticism. 10 out of 60 wouldn't be a whole lot, and those who would like it would still go to your site to play the complete version. As of now, since I actually feel cheated by this... "demo?" I actually feel no interest toward the game. That was actually a very bad move.
There are 3 levels available on NG and, if you can read, all the levels are available to play at my website.