The idea is nice. The wack-a-mole is quite hard as we don’t really know where the hammer will go, and the first time the game is played, the high score is not displayed at the end. I had fun catching the chicken but had the same high score problem. I also had UI overlaps (in the browser). Finally, I had a hard time steering the car for the race game and had a strange grey square around it.
You should maybe try chaining the mini-games (when one finishes, the next starts) and making it more and more fast/hard as the player finishes them.
Good job!