This is not a complete level guide, but a link to a video for the final boss fight. After spending way to long and getting really frustrated as to why they put this rubbish into what was a very good adventure game, I went looking and found this.
https://www.youtube.com/watch?time_continue=477&v=7tsfMh...It was made by JenSteam and all credit goes to them. If you follow all the moves they make and where they stand you should get this no trouble, and save yourself a lot of screaming.