jhauberg
As a fellow XNA'er, and probably the only dude (besides you) in this community with .NET AND XNA installed, I felt it was my duty to try your game.
Generally your game just lacked polish, but it was cool how certain things stuck to the ball, and it looked pretty good. It would have been even cooler (but probably a good bit more complex) if the rolling of the ball was affected by its current state, and if you started being able to roll down the larger cactus plants, or even cars, once you reached a certain size.
What I didn't like about your game was that it took me a while just to understand what was going on, what I had to do, and how to get the ball under control. The initial startup was totally frantic, and I think I got stuck in a couple of cars before even gaining control of the ball. A starting "Press whatever to play"-screen, and initial state that wasnt just random would have eased me into the game much better.
In regards to the controls, everything seemed to just go way too fast, way too quickly. Might just be me, but I think that smoother zooming/speed gain would have made it a much better experience to play.
(NOTE: I only tried it with my xb360 controller, no keyboard)
EDIT: going back and looking at screenshots, I guess I just didn't play long enough to be able to stick to the cars/larger plants.