Nice game!
The start is very relaxing, but after level 5 it start to become a lot more frustrating. too many pandas around in so little space.
2 things about the gameplay. some leaves be go behind the rocks and the backet, and that will make it almost impossibile to find them. The optimal way to play is just to just stuck up leaves on the ground (and probably that's your goal considering the 20 leaves max per click). What feels frustrating about this is that you don't know how many are there, so you group them thinking they are all, and when you put, you find out there 1 is missing. that 5 pandas will go on the basket and repeat until you find the last leaf :)
Aside these small elements, nice game and idea :) well done!