Oh yeah, we kinda messed up when it comes to making the background/foreground look different from the actual ground. Parallax would help but it is very annoying to set up (you probably understand if you've ever worked with it before). The music took some time to make, I'm really glad people like it. Also for the physics we were going for something like Hill Climb Racing, sadly I pretty much failed in making good suspension.
Thanks for the feedback! =]