Hello Aero,
I tried to play the epic boss in chapter 6 recently. Here are some remarks:
First, I don't know if I am the only one experiencing this but the longer the fight takes the laggier the game goes. I think it has got something to do with all the objects in motion. This makes it very hard to control the fight. Once again, I don't know if others have experienced this as well.
Second, I think the boss is way to hard. It took me nearly 35 lives and I still found no way to sucessfully finish the fight. He had a skill to fully restore his hit points once in a while so it was impossible to bring his hit points down. Moreover he had a skill with which he could instantly kill Galeoth and Fradz.
Summarizing I suggest that you at least reconsider his ability to FULLY RESTORE his hit points so players can find a way to bring him down.
Thanks and greetings
manstein
Edit: Figured out what is restoring his hit points. Still I think its way to hard, as the death coils are quite fast and you must really concentrate to hit those. Maybe only giving the epic boss partial hit point restoration from them and not full hit point restoration . Summarizing its till took about 25 lives to kill this boss, which I think is too hard.