Okay, I see where they were going with this, but overall it feels like this was took out of the oven half baked. Half of the buttons give a 'not yet implemented' message, and whilst at home the 'scrolling on phone' option as far as I could tell puts you in an inescapable cycle.
There at current seems to be only 1 track, and all opponents have the same difficulty. That and as pointed out by others you can reverse across the starting line and back to finish in less than 6 seconds.
There is an error message of: "Error ending race: raceWin" whenever you win a race. Thankfully you still get exp and $ for each win.
The rewards you get are based on your opponent, bigger girls give more, and are more likely to show up as you lv up Daisy & your car. The problem is the XP values are fine, but the $ values feel lackluster atm. Sure if this was developed more, I'm sure FAR more massive girls might show up, but right now the yields are for XP &$ per opponent:
6 / 12
14 / 28
22 / 44
30 / 60 (I didn't even get one of these to show up until I believe lv7 and max lv is 9 atm)
Problem is that your lv and car score overtime may increase higher value opponents, but it scales far too slow. Even at max level and a car score over 20 I frequently get the lowest value opponents. Oh yeah doesn't help you cannot choose and are picked at random. I've gotten the smallest girls whilst at lv9 three to four races in a row.