Graphics: Good, but can always be better.
UI: It's simple and I actually kinda like it.
Difficulty: Difficult (Although my Dad did manage to beat the easy AI so it's not impossible)
Content: Moderate, Not many Maps or Cars to choose from.
Replayability: It contains everything that can keep you hooked up (Time scores, unlocking cars/maps, Beating the AI, etc)
Music: It's great, period.
Conclusion: Overall, for a game that was probably made in a few weeks it's actually really good, I had lots of fun with it and can also be rather rewarding at times.