A few critiques for Gridshift are that when the game starts, the camera only shows the straight track and one curved track. On my first playthrough, I didn't see the second curved track so that made me think that i should buy another curved track. For the gameplay itself, even at maximum speed the cars would go agonizingly slow which would probably make people just leave your game because they don't want to wait. Critiques aside, I liked your game idea and thought it was very original! I also like the music choice. Subtle, not intrusive.