Could be better.
A decent first game, but it could be good with some work. The instruction screen is wordy and dull. The movement of the buggy is jerky, and the racing feels flat, with no screeching, dust, or a sound when you make a lap. The star/diaper containers are a bit troublesome, because at the moment they're pretty much a coin toss. The player's score goes up and down without any control on the player's part. Maybe you could have the items inside be knocked out ahead of the car, so that the player has more of a chance to swerve out of the way?
Also, there's no way in-game to decide whether you're doing a good job. No opponents on the track, no bronze/silver/gold medals, no target times, not even a "good job!" or a "try harder!" I'd include something like that, or if it's displayed later in the game, display it after each race.
In general, think about how the choices you as a developer make affect the player's experience.