The game is fun in short bursts if you don't take it seriously, it's obviously a cute & light-hearted racing game for kids & presents itself well as such, but gameplay is just buggy & lacking when you get down to it.
Nothing particularly innovative and it doesn't even do the stuff it does well.

AI dumb as bricks. There's easymode for kids and then there's whatever this is.
The AI doesn't cut corners or seem to ease off the acceleration at all for turning so it's very easy to just pass them in the first 1/4 lap.

AI frequently gets stuck on random parts of the map.

eg: In a boat level I played, Hello Kitty ran into a wall from overacceleration and then started going backwards for 1/3 of a circuit until she got stuck in a corner for the rest of the race. She didn't complete a single lap. The dog, Purin, in 10th JUST STOPPED MOVING in the middle of the course after its first lap.

http://i.imgur.com/RC1wC1E.png

Yet somehow, despite me being first the entire race, Purin has a lap time ~20s faster, and HK inexplicably came in 2nd despite never finishing a single lap.
The scoring system is remarkably bogus.

Another race: http://i.imgur.com/KBNGkzG.jpg
AI stuck on a hill since the first lap.

While you can turn on controller/gamepad support within the game, analog stick/dpad doesn't work for menus.
No exit button to close the game as other people mentioned.
Powerups don't overwrite if you have one picked up already. Particularly frustrating if you get the 3-shot cupcake equivalent of green koopa shells.
Boat controls in particular are pretty floaty but the car handling wasn't terrible.

By no means worth 20 bucks.

The game is fun in short bursts if you don't take it seriously, it's obviously a cute & light-hearted racing game for kids & presents itself well as such, but gameplay is just buggy & lacking when you get down to it. Nothing particularly innovative and it doesn't even do the stuff it does well. AI dumb as bricks. There's easymode for kids and then there's whatever this is. The AI doesn't cut corners or seem to ease off the acceleration at all for turning so it's very easy to just pass them in the first 1/4 lap. AI frequently gets stuck on random parts of the map. eg: In a boat level I played, Hello Kitty ran into a wall from overacceleration and then started going backwards for 1/3 of a circuit until she got stuck in a corner for the rest of the race. She didn't complete a single lap. The dog, Purin, in 10th JUST STOPPED MOVING in the middle of the course after its first lap. http://i.imgur.com/RC1wC1E.png Yet somehow, despite me being first the entire race, Purin has a lap time ~20s faster, and HK inexplicably came in 2nd despite never finishing a single lap. The scoring system is remarkably bogus. Another race: http://i.imgur.com/KBNGkzG.jpg AI stuck on a hill since the first lap. While you can turn on controller/gamepad support within the game, analog stick/dpad doesn't work for menus. No exit button to close the game as other people mentioned. Powerups don't overwrite if you have one picked up already. Particularly frustrating if you get the 3-shot cupcake equivalent of green koopa shells. Boat controls in particular are pretty floaty but the car handling wasn't terrible. By no means worth 20 bucks.