Something’s wrong with this level. Near impossible to feed frog every 2-3 turns to get hard to reach places, flying saucer not much of a help. 3 colors instead of 4 would still be hard but doable. Not much space to create chocolate balls
I can't find any mistakes according to your screenshot. Your main weapon for this level is the frog, you repeatedly fill the frog and try to unlock the locked spaces with the help of the frog.