hi , yes we are talking about the same thing ! i had been trying the route you recommend but couldnt get that way , must try harder !
i managed to bypass the 3rd boss - dropped down onto the top platform , then the one below and down to the ground ... this draws the boss closer to ground level . then quickly jump back up the platforms to the top one and double jump over him to the exit - job done !
i will try your way tonight but have a feeling i wont be able to beat the final boss :)
thanks again