I think Nickelodeon went into decline after 2014. They had many good projects, but then they started releasing mediocre cartoons. I honestly don’t remember Ladybug being shown on Nickelodeon.
1) Perhaps you have downloaded the Chinese version of the game instead of the Japanese one; the Chinese version was released later, so many features might not have been added yet. 2) Your level might be too low, or you haven't met some requirement in the tutorial.