The graphics are very nice! But you can see that from the screen shots. The timed tracks are a cool idea too.
Unfortunately, the 10x XP mode cannot be earned. This mode lets you level up faster. You get three credits to begin with. And once these are gone, more can be purchased only via IAP. The 1XP and 10XP mode selection is confusing. So are the in-game stars and glowing strips around curves. What do these do? No tutorial or explanation. Most of the game is confusing. That includes the car-selection menus.
Also, there are only two-button and tilt control mechanisms. It would be nice to have a joystick like Death Rally. I've only played on iPhone. So maybe these controls are better on iPad.
Overall, I just don't see this game sticking around on the top charts. I would suggest making it a paid game and earning 10XP mode. Maybe after getting a "Perfect" grade 10XP is awarded. Or incorporate a bonus minigame like Jetpack Joyride to earn 10XP.
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