Does it wow you?
Does now. A whole lot more slick and polished than the first demo I tried, especially the controls. Beautiful, it is :)
Does the challenge level frustrate you too much?
No.
How much time does it take you to go through this demo?
About ten minutes.
Do you want to buy it?
I might just do that.
The buy-now button all over the place was a bit annoying and cheesy (I always think those things are), but I can imagine it serves it's purpose well. Just don't make it flash up or animate or some other attention-seeking s#$%!