I don;t know if you have got this one but try going this way as there is one more bug ...

From the platform ...turn left and you will see two wooden logs on the water thats the way you have to go to get to the other bugs get past the wodden logs and keep going on the leaves till you reach a platform ... don;t go back where you already killed the bug ....there will be another two wooden logs get past and get to the plat form ..there will be a large wooden log ..open for you to walk through....... cross the cutting tool going up and down and you will reach a platform...

Walk down and the other bugs will lead you to another one of those bugs...I have completed killing all the bugs but don't know how to get out ...let me know if you get there