Such a great remix!
I've never been too much of a fan of those balancing your bike/truck/whatever games, but this one provided a different element that made it a lot more entertaining to me.
The difficulty curve seemed to be on par, and a good pace.
As mentioned earlier by some others, the replay value really is lacking, and beating your best times does become more of a undesirable task.
I hope a sequel with an even bigger twist comes along =)